This is an action of tort in the nature of waste. The defendants constituted the board of health in the city of Everett. The plaintiff was the mortgagee of certain real estate in that city, the buildings upon which consisted of one house of three tenements and a store and a stable. On or about the twenty-first day of December, 1901, the defendants, acting as members of the board of health, leased of the mortgagor said premises “ to be used as a contagious hospital.” Occupation for that purpose began at once and continued until December 22, 1902, during which period forty-two persons sick with smallpox were treated, six of whom died. The plaintiff did not know of the lease nor of such occupation until after it had continued for several months. The defense is that the acts complained of were done under the authority of the lease given by the mortgagor. It is to be noted that the defendants did not proceed under Pub. Sts. c. 80, § 43, then in force (now R. L. c. 75, § 46, as amended by St. 1906, c. 365, § 2). They undertook to perform the public duty incumbent upon them of providing a proper place for the treatment of persons suffering from smallpox by agreement with the mortgagor, and not by any exercise of the power delegated by the Common wealth.
Whatever may be the law in other jurisdictions by statute or otherwise, “ it has long been settled in this Commonwealth that, as to all the world except the mortgagee, a mortgagor is the owner of the mortgaged lands, at least till the mortgagee has entered for possession.” Dolliver v. St. Joseph Fire & Marine Ins. Co. 128 Mass. 315. Whether the mortgagee is in possession of the mortgaged premises or not, or whether his right to possession begins only with the breach of condition and there has been no breach, nevertheless he has such an interest in the property and its preservation as enables him to maintain an action in his own name for injury to it. Such right of action is founded not upon the right to present possession, but on title to the estate. He may maintain such an action, although he is a junior mortga*370gee and although the security remains ample for his protection. He has a right to his security unimpaired. The leading principles by which the rights of mortgagor and mortgagee may be worked out are clearly explained by Wells, J., in Gooding v. Shea, 103 Mass. 360. Cases which recognize a right of action in the mortgagee to recover damages for injury to his security are numerous. See for example James v. Worcester, 141 Mass. 361; Wilbur v. Moulton, 127 Mass. 509; Searle v. Sawyer, 127 Mass. 491; Byrom v. Chapin, 113 Mass. 308, 311; Stewart v. Finkelstone, ante, 28; Ocean Accident & Guarantee Corp. v. Ilford Gas Co. [1905] 2 K. B. 493; Fidelity Trust Co. v. Hoboken & Manhattan Railroad, 1 Buch. 14. An action for such injury lies as well against the mortgagor, although rightfully in possession. The mortgagor is liable to the mortgagee for waste. The mortgagor in this respect stands to the mortgagee as a tenant to a landlord, or a tenant for life to a reversioner. Goodman v. Kine, 8 Beav. 379. King v. Smith, 2 Hare, 239. Page v. Robinson, 10 Cush. 99. Hutchins v. King, 1 Wall. 53. A lease made by the mortgagor after the rights of the mortgagee have become fixed cannot affect the latter in any way without his consent. Tilden v. Greenwood, 149 Mass. 567. Elmore v. Symonds, 183 Mass. 321.
The fundamental question, therefore, is whether upon the facts agreed it was permissible for the jury to find that waste had been committed. Under the conditions prevailing in this Commonwealth wasté is an unreasonable or improper use, abuse, mismanagement or omission of duty touching real estate by one rightfully in possession which results in its1 substantial injury. It is the violation of an obligation to treat the premises in such manner that no harm be done to them and that the estate may revert to those having an underlying interest undeteriorated by any wilful or negligent act. Pynchon v. Stearns, 11 Met. 304. United States v. Bostwick, 94 U. S. 53, 65. Moore v. Townshend, 4 Vroom, 284. Turner v. Wright, 2 De G., F. & J. 234, 246. 30 Am. & Eng. Encyc. of Law, (2d ed.) 255, and cases cited. Waste does not necessarily mean a subtraction of something from the corporal substance of the estate. Perhaps it may not always include change in material condition, though it is not necessary to decide that point in this case. Its *371early and frequent application was in an agricultural sense, where it means a damaging use not in accordance with good husbandry. Pratt v. Brett, 2 Madd. 62. Patterson v. Central Canada Loan & Savings Co. 29 Ont. 134, 137. It generally consists in some definite physical injury. This is shown by reference to the earlier definitions, as for instance that of Blackstone, who calls it a “ spoil or destruction in houses, gardens, trees, or other corporeal hereditaments.” 2 Black. Com. (Sharswood’s ed.) 281.
On principle it follows that mere injury to the reputation of real estate or the supposed diminution of its value resting on whimsical or emotional grounds or arising from dictates of custom or taste do not constitute waste. These considerations have nothing to do with material substance, but depend upon evanescent or intangible preferences or prejudices. It is the commonly accepted view that smallpox is a contagious disease, spread through the instrumentality of germs, which although invisible to the naked eye are perniciously active and capable of causing loathsome and often fatal sickness. In Commonwealth v. Pear, 183 Mass. 242, is a statement of the judicial notice which the court will take of the horrors of smallpox. From the agreed facts the jury would have been warranted in finding that this building was filled in every no.ok and crevice with the microscopic germs of this dreaded disease. This might have been found to constitute an essential alteration in the qualities and condition of the house with reference to the purposes for which it was intended to be used, síicb as to constitute a definite injury. Inoculation with germs of glanders was held to be a “ bodily injury ” in H. P. Hood & Sons v. Maryland Casualty Co., ante, 223. Sowing the seeds of noxious weeds was restrained as waste in Pratt v. Brett, 2 Madd. 62. Impregnation of a building with the indiscernible but vital germs of a dangerous malady is closely analogous to the sowing of seeds of deleterious plants, and may be in its effect far more detrimental. It may be in fact even more harmful than to tear down or remove a part of the building. It is in principle the same general kind of damage as the more familiar instances of waste. The possibility of germination of the disease germs which, it might have been found, were deposited through the action of the defendants within the house *372in question was or might have been found to be waste, unless it is shown that they can be removed by disinfection or otherwise without material physical change in the building, so as to make it as safe for residence as before. Whether this can be done or not depends upon evidence. Hersey v. Chapin, 162 Mass. 176, while not decisive of the present case, seems to go upon the ground that the use of a building as a smallpox hospital might be an injury to the reversion. See also United States v. BostwieJc, 94 U. S. 53.
- A case like the present should be submitted to the jury under instructions which would permit the plaintiff to recover the diminution in the value of his property for every valuable use among ordinarily intelligent men arising from the occupancy for a smallpox hospital, provided the jury were satisfied that it was not reasonable and proper to let the building for this purpose, having reference to the probable effects upon its future growing out of the presence of disease-producing conditions, in view of the existing state of the art of disinfection or other way of rendering it healthful, and excluding all sentimental or fanciful notions affecting only its reputation.
From an examination of the record there appears to be ground for the view that the case was tried throughout upon the theory that recovery was sought and could be had for injury to the reputation of the estate apart from any physical waste, and that the stipulation and agreement, that, in the event of the ruling to the effect that the plaintiff could not recover being wrong, judgment should be entered for the plaintiff, was made and entered'into under such a misapprehension as to render what has taken place a mistrial or to make it unjust to hold the parties to it in view of the present opinion. The declaration is broad enough to include damages of the nature which we have held maybe recovered. Hence the entry should be: Judgment for the plaintiff for the' sum found by the jury, unless within sixty days from the filing of the rescript the justice of the Superior Court before whom the trial occurred shall decide after hearing that under these circumstances justice requires a new trial and enter an order to that effect.
So ordered.