The first count of the complaint is framed under subdivision 1 of section 3910 of the Code, and bases plaintiff’s right of recovery upon a defect in the machine furnished him to work with.
The second and third counts are framed under subdivision 2 of the statute, and impute the injury to the negligence of a person in the service of defendant_who had superintendence intrusted to him, while exercising such superintendence; the charge being that such person “caused or allowed plaintiff’s glove or hand covering to be caught on the occasion aforesaid, and plaintiff to Suffer said injury or damage.”
The fourth count charges a breach of common-law duty owed by defendant to plaintiff in this, to wit: “That defendant negligently furnished the plaintiff a person to help him in doing said work which plaintiff was employed by defendant to do, and which person so furnished by defendant for said purpose, to wit, a negro called Charlie, whose name is otherwise unknown *558to plaintiff, was not reasonably competent to do that part of the work which he was employed by defendió do, to wit, act as helper for plaintiff in and about operating said machine.”
We will separately discuss these three phases of the case.
1. The air motor with which plaintiff was working when injured was supplied to him by defendant’s boss boiler maker, under whom plaintiff and his helper Avere working, with the injunction to use it in his work. When plaintiff applied to the boss, Weise, for a motor, the latter replied that there were some in a box in the back shop, and he or the toolroom boy Avent and got this motor and brought it to plaintiff. Under the first count plaintiff could not recover merely upon a showing that the motor was defective. He was bound to affirmatively show that the defect complained of arose from, or had not been discovered or remedied owing to, the negligence of defendant, or his superintendent in that behalf. — Seaboard Mfg. Co. v. Woodson, 94 Ala. 143, 146, 10 South. 87; Mary Lee G. & R. Co. v. Chambliss, 97 Ala. 171, 11 South. 897. In this plaintiff has utterly failed, for we find nothing in the evidence that has any tendency to establish such negligence, even if it be conceded that there was a defect in the motor which rendered it unsuitable or unsafe for the use to which it Avas devoted.
It does not appear that the motor was originally defective, nor Avhen, hoAV, or under Avhat circumstances the defect arose, nor that it was ever known, or made known, to defendant or its vice principal: It was a latent defect in the sense that it was discoverable only by practical and long-continued use by an operator. It is obvious that such preliminary or subsequent tests of efficiency are not required of the master, for they *559are unusual, and entirely impracticable with respect to such machinery as this. — L. & N. R. R. Co. v. Allen, 78 Ala. 494; L. & N. R. R. Co. v. Campbell, 97 Ala. 147, 153, 12 South. 574; Smoot v. M. & M. Ry. Co., 67 Ala. 13, 19, 20. Nor was there any fact or circumstance known to defendant or its superintendent which should have put it on notice that this motor was in any way defective.
The statute does not change the nature of the duty owed by masters to their servants in this regard. That duty was, and is, “to use ordinary care and diligence to furnish safe and suitable instrumentalities and appliances for the use of their employees in their business, and to keep the ways, works, machinery and plant free from defects which are dangerous, so as not .to expose their employees to unnecessary perils — such care and diligence as men of ordinary prudence would exercise under like circumstances.” — -Wilson v. L. & N. R. R. Co., 85 Ala. 269, 272, 4 South. 701; Smoot v. M. & M. Ry. Co., 67 Ala. 13. On the facts shown there could arise no inference that defendant was guilty of the negligence charged. — Mary Lee G. & R. Co. v. Chambliss, 97 Ala. 171, 176, 11 South. 897.
2. The only testimony of any superintendence is plaintiff’s testimony that Weise “was my boss, and in charge of that part of the business, and had charge of the machines.” There is no evidence that it was any part of his duty to procure the machines originally, or to inspect them afterwards. And, as already pointed out, there is no evidence that he knew of any defect in this particular motor, or had any reason to suspect its presence, or that by any practicable inspection He would have discovered the defect if he had so suspected. Nor does it appear that he directed the mode of its use by plaintiff, or had any connection with the circumstances *560of the accident. The second and third counts were therefore wholly unsupported by the evidence. — Thomas v. Bellamy, 126 Ala. 253, 257, 28 South. 707.
3. Under the fourth count the only evidence of the incompetence of plaintiff’s helper, the negro, Charlie, was plaintiff’s bare statement that he was not a competent person to help at the work he was then doing. No instances of his incompetency were specified, and on cross-examination plaintiff stated that he knew how to couple the hose to the air post and cut off the air at the post, and that he had always done those things properly. There is nothing in the evidence from which it can be inferred that defendant had any knowledge, or was in any way put upon notice, that this helper was not a fit person to be intrusted with the performance of the simple and menial services that plaintiff might call upon him to render, services which required no technical skin and but little intelligence, and were to be performed under the orders and immediately under the eye of plaintiff. Certainly but little watchfulness would be required of the master or its vice principal in the selection and supervision of such servants. It is true that plaintiff says that on the day of the accident he had twice spoken to Weise “about this negro Charlie, as to his fitness.” I>ut whether he spoke in terms of praise or of disparagement is not made to appear, and is in fact a matter of mere conjecture, so far as the record informs us.-
The law on this subject was stated, per Anderson, J., in First Nat. Bank v. Chandler, 144 Ala. 308, 39 South. 828, 113 Am. St. Rep. 39, to be that in order to recover against the defendant the plaintiff “is bound to show by affimative testimony: (1) That the injury was the result of the act or omission of some fellow servant; (2) that said servant was incompetent for the duty he had *561to perform; (3) that the fact of his incompetency was known to the defendant, or that it, or its manager or superintendent, acquired a knowledge of it during his employment and before the accident, or by due diligence could have learned of his incompetency.” It was further said that: “Negligence such as unfits a'person for service, or such as renders it negligent in a master to retain him in the employment, must be habitual, rather than occasional, or of such a character as to render it imprudent to retain him in service.” And again, quoting from Bailey on Master’s Liability, etc.: “It is proper, when repeated acts of carelessness and incompetency of a certain character are shown on the part of a servant, to leave it to the jury whether they did come to the knowledge [of the matser] if he had exercised ordinary care.”
But in Conrad v. Gray, 109 Ala. 130, 19 South. 398, it is declared that a single act of negligence would prove neither incompetency nor notice to the master.
This helper had been in the employ of defendant for about a year, and had worked with plaintiff, off and on, for a month or more, and not a single act of incompetency is shown. So far as his original selection is concerned, the law presumes that defendant exercised due care therein. — Conrad v. Gray, supra; Bailey on Master’s Liability, etc., 55. This presumption is Tiere in no wise impeached. And, with respect to his retention in the service, there is nothing to show defendant’s knowledge, or to charge ’it with notice, of his incompetency, or that due diligence would have discovered any incompetency. On such a showing, as matter of law, plaintiff was not entitled to recover on this count.— Conrad v. Gray, 109 Ala. 130, 135, 19 South. 398.
The foregoing views of the evidence lead to the conclusion that the general affirmative charge was properly given for defendant.
*562It remains to consider whether there was prejudicial error in any of the rulings on the evidence.
It is settled in this state that where a particular employment requires technical skill, an expert who is shown to have a general acquaintance with the employment, and who knows the particular services incident thereto, and has sufficiently observed a. particular person in the course of such an employment, may testify that such person is competent or incompetent for such employment.- — Buckalew v. T. C. I. & R. R. Co., 112 Ala. 146, 159, 20 South. 606. The expert’s opinion is allowed in such a case only because, and when, .the jury cannot be assumed to understand the subject, and to be able to reach an intelligent conclusion of their own, without such expert assistance. This rule was applied, in the case cited, to the position of mine boss or superintendent. By way of contrast, it has been held that the president of an oilmill could not testify whether or not his managing employee “was a good man to manage hands.” The court said: “This inquiry went to the plaintiff’s competency as a superintendent of the business in which he was employed, and involved a mere expert opinion of his qualifications. The capacity to manage hands is not such a question of science or skill as that jurors would be incompetent to form a correct judgment upon it without enlightenment by expert testimony. The facts showing incapacity in this particular should have been stated, so-that the jury might themselves decide the question.” — Troy Fertilizer Co. v. Logan, 90 Ala. 325, 8 South. 46. These observations apply to and control the present case with respect to the competency of plaintiff’s negro helper, and the opinion of the witness Hopp as to his competency was properly excluded.
*563This witness Hopp, testifying for plaintiff, stated that he went to work the next morning on the job left by plaintiff after his injury, and that he found there á motor drill like the one used by plaintiff, and that it was defective. On cross-examination he stated that he had no personal knowledge that this machine was at the place where plaintiff was working, nor that it was the same machine used by plaintiff the day before. It appeared, also, from plaintiff’s testimony that there were a number of these motors in use in defendant’s shops, and that there were from five to ten engines in the back shop, where plaintiff worked, being worked on by other workmen. Under this evidence we think the trial court did not err in excluding the testimony of Hopp as to the defective condition of the motor which he found ready for his own use in this back shop the next morning after the accident. Whether it was the same motor or not the jury could only have guessed.
Plaintiff asked this Avitness these questions: “How did you identify the place as being the place where Mr. Owen is supposed to have been hurt?” and, “How did you find out that that was the place where he was hurt?” No statement was made as to what was expected to be shoAV-n by the answers, and, as they might as Avell have been answered by illegal as by legal evidence, the court cannot be put in error for excluding the questions. — B. R., L. & P. Co. v. Barrett, 179 Ala. 274, 60 South. 262.
What the boss told Hopp, after the injury to plaintiff, as to where plaintiff was working was mere hearsay, and not admissible against defendant to prove that ■ fact.
Plaintiff, testifying as a witness for himself, was asked by his attorney if his boss did not know that those sockets had burrs on them, and if. during the 30 or 60 *564days he had been working, there had been burrs on them. These questions were not confined to the socket used by plaintiff: at the time he was injured, and were for that reason properly disallowed.
Plaintiff was also asked by his attorney, with respect to his negro helper, “What was his duty about cutting off air when you told him?” This question was disallowed on defendant’s objection, on the ground that the helper was a fellow servant, and any failure in his duty was immaterial. There had been no testimony, at that stage of the trial, that this helper was an incompetent servant, and prima facie any inquiry as to this particular duty was inadmissible, as not bearing upon that-general inquiry. Moreover, the witness stated at other times that his helper was not allowed to cut off the air at the motor, and that he regularly cut it off at the post, vvhich substantially answered this question.
We have discussed these several rulings upon their individual merits. It is to be observed, however,, that had the ruling in each case been favorable to plaintiff, the presence of all of this rejected testimony would have had no tendency whatever to supply or cure- the fatal deficiencies of proof as to a material and essential element of plaintiff’s case under each count of the complaint, which we have undertaken to show above.
The judgment will be affirmed.
Affirmed.
Dowdell, C. J., and McClellan and Sayre, JJ.,. concur.