It is often a matter of difficulty to determine whether an action is in form ex contractu or ex delicto. Perhaps the best criterion is this; if the cause of action, as stated in the declaration, arises from a breach of promise, the action is ex contractu; but if the cause of action arises from a breach of duty, growing out of the contract, it is in form, ex delicto and case. *291For instance, if the declaration allege the hiring of a horse to ride to a certain place, and that the defendant rode him so immoderately that he died, this would be case; for the contract of hiring imposed upon him the duty to ride in reason, or not unreasonably fast; but if the declaration allege the hiring, and that he promised to ride with reasonable speed, but not regarding his promise he rode the horse immoderately, whereby he died, the action may be considered assumpsit. So the duly or obligation of one, who hires a slave, is, to trea thim with care, and should the hirer, in violation of that duty, over-work the slave, or refuse to furnish him with suitable provisions, in consequence of which he dies, the owner may sue him, and declare either in assumpsit or case; if he declare in assumpsit, the declaration must allege a promise to work the slave reasonably and to furnish him with suitable provisions, and then a breach of that promise ; but if he declare in case, it will be sufficient to allege the hiring and the tortious conduct of the hirer, whereby the death of the slave occurred. This we think to be the result of all the cases. But whether the action be in form assumpsit or case, it is beyond doubt certain that the proof must correspond with the declaration. Mr. Chitty says, “that in an action on the case, founded on an express or implied contract, as against a carrier, attorney, agent, inn-keeper, or other bailee, for negligence, the declaration must correctly state the contract, or the particular duty, or consideration, from which the liability results, and on which it is founded, and that a variance in the description of the contract, though in an action ex delicto, may be as fatal as if it were ex contractu. — Chitty’s Pl. vol. 1, 384. In this, we think, the author is fully supported by the cases of Ireland v. Johnson & Vaughn, 1 Bing. N. C. 162 ; 3 Brod. & Bing. 54; and many others that might be cited. Whether the plaintiffin declaring in case on a duty growing out of the contract is bound to set out all the contract, or only that portion of it, out of which the duty arises, it is not necessary to decide. We should, however, be inclined to think that it would not be necessary in every case to set out the entire contract, but that so much of it as showed the duty imposed thereby on the defendant would be sufficient. Yet it is very clear that the acts or omissions of the defendant, which are insisted on as a tortious violation of the duty imposed by his contract, must be proved *292as alleged; otherwise we should depart from the well settled rule that the allegata and probata must correspond.
Testing the declaration and the proof by this rule, we are clear in the opinion that the court erred in the first charge given to the jury. This was, that if the girl was hired, to be kept in the city of Montgomery, and to be employed as a cook by the defendant, and without the permission or assent of the plaintiff, be re-hired her to Hughes, to be taken to the country and employed in a different manner, it was such a breach of duty as rendered the defendant liable. Now if it be admitted that the evidence warranted this charge to the jury, yet it is certain that the declaration contains no averment, that it was a term of the contract of hiring, that the defendant should not re-hire the slave to go to the country, or to be otherwise employed than as a cook. The declaration alleges merely the hiring and the promise of the defendant to treat her with care in case of sickness, and should it be necessary, to call in a physician, and the right of the plaintiff to recover is based by the declaration on the non-observance of these promises. The court, however, instructed the jury, that if the evidence showed that it was a term of the contract that the slave should not be re-hired to go out of the city, and be employed in a different service, the plaintiff could recover. If this be correct, he would be permitted to recover on the violation of a term of the contract not set forth in the declaration, and even where no term of the contract, as described in the declaration, had been violated. To allow this would simply amount to permitting a plaintiff to declare for one thing, and to recover for another.
We think the second instructions of the court were also erroneous. It is true that if one hire a slave for a limited time, and fails to deliver him back to the owner at the expiration of the term of hiring, he would be prima facie liable for his value; for it is a duty imposed by the contract, that he will re-deliver the slave to him at the expiration of the term. Yet if the defendant showed that the slave had died during the term of hiring,.this would acquit him, unless.it v^as shown in reply that the death of the slave was the result of some violation of duty, imposed on the defendant by the terms of the contract; but if the death of the slave alone be shown by the defendant, the burthen of proof is on., the plaintiff to show that the death resulted from a violation of *293duty on the part of the defendant. It may, however, often happen in practice, that the proof introduced to show the death will also show the circumstances under which it took place, and it is then for the jury to determine, under all the proof, whether the death was the result of the violation of duty on the part of the defendant, or whether it was from causes beyond his control.
This view shows that the judgment must be reversed and the cause remanded for another trial, and we deem it unnecessary to decide any other of the many questions presented by the assignments of error, as they will not probably arise precisely under the same circumstances upon a future trial. If the declaration should be amended, and the proof should show that it was a term of the contract of hiring that the slave should not be rehired out of the city of Montgomery, it will then be time enough to decide, whether the violation of that term of the contract would render the defendant liable. It may be remarked, however, that the cases, refered to by the counsel in argument, will probably guide the court correctly, should it become necessary to decide that question on another trial. Let the judgment be reversed, and the cause remanded.