In order to understand section 4059 of the Code of Iowa it must be read in connection with the preceding section, 4058, to which it refers. It must also be known what is meant by 'Texas cattle,' and what influence a winter north has upon the disease called 'Texas Fever,' with which such cattle are liable to be infected. Section 4058 is leveled against the importation of Texas cattle which have not been wintered north of the southern boundary of Missouri or Kansas. Any person bringing into the state Texas cattle, unless they have been thus wintered, is subject to be fined or imprisoned. When, therefore, section 4059 refers to the possession in the state of any 'such Texas cattle,' it means cattle which have not been wintered north, as mentioned in the preceding section. It is only when they have not been thus wintered that apprehension is felt that they may be infected with the disease, and spread it among other cattle. The term 'Texas cattle' is not defined in the Code of Iowa; and whether used there to designate cattle from the state of Texas alone, or, as averred by the plaintiff in error, a particular breed or variety called Mexican or Spanish cattle, which are also found in Arkansas and the Indian Territory, is not material for the disposition of this case. Cattle coming from both of those states and from that territory, during the spring and summer months are often infected with what is known as 'Texas Fever.' It is supposed that they become infected with the germs of this distemper while feeding, during those months, on the low and moist grounds of those states and territory, constituting what are called their malarial districts, which are largely covered with a thick vegetable growth. These germs are communicated to domestic cattle by contact, or by feeding in the same range or pasture. Scientists are not agreed as to the causes of the malady; and it is not important for our decision which of the many theories advanced by them is correct. That cattle coming from those sections of the country during the spring and summer months are often infected with a contagious and dangerous fever is a notorious fact; as is also the fact that cold weather, such as is usual in the winter north of the southern boundary of Missouri and Kansas, destroys the virus of the disease, and thus removes all danger of infection. It is upon these notorious facts that the legislation of Iowa for the exclusion from their limits of these cattle, unless they have passed a winter north, is based. See Railway Co. v. Finley, 38 Kan. 556, 16 Pac. Rep. 951. Also, First Annual Report to the Commissioner of Agriculture of the Bureau of Animal Industry for 1884, p. 426, and Second Annual Report of same bureau for 1885, p. 310.

Section 4059, with which we are concerned, provides that any person who has in his possession in the state of Iowa any Texas cattle which have not been wintered north shall be allowing such cattle to run at large, and thereby spread the disease. We are unable thereby spread the disease. We are unable to appreciate the force of the objection that such legislation is in conflict with the paramount authority of congress to regulate interstate commerce. We do not see that it has anything to do with that commerce. It is only leveled against allowing diseased Texas cattle held within the state to run at large. The defendants labor under the impression that the validity of section 4058, which is directed against the importation into the state of such cattle unless they have been wintered north, is before us, and that a consideration of its validity is necessary in passing upon section 4059; but this is a mistake. Section 4058 is before us only that we may ascertain from it the meaning intended by certain terms used in the subsequent section referring to it, and wot upon any question of its constitutionality. Nor does the case of Railroad Co. v. Husen, 95 U. S. 465, upon which the defendant relies with apparent confidence, have any bearing upon the questions presented. The decision in that case rested upon the ground that no discrimination was made by the law of Missouri in the transportation forbidden between sound cattle and diseased cattle; and this circumstance is prominently put forth in the opinion. 'It is noticeable,' said the court, 'that the statute interposes a direct prohibition against the introduction into the state of all Texas, Mexican, or Indian cattle during eight months of each year, without any distinction between such as may be diseased and such as are not.' Page 469. It interpreted the law of Missouri as saying to all transportation companies: 'You shall not bring into the state any Texas cattle, or any Mexican cattle, or Indian cattle, between March 1st and December 1st in any year, no matter whether they are free from disease or not, no matter whether they may do an injury to the inhabitants of the state or not; and if you do bring them in, even for the purpose of carrying them through the state without unloading them, you shall be subject to extraordinary liabilities.' Page 473. Such a statute, the court held, was not a quarantine law, nor an inspection law, but a law which interfered with interstate commerce, and therefore invalid. At the same time the court admitted unhesitatingly that a state may pass laws to prevent animals suffering from contagious or infectious diseases from entering within it. Page 472. No attempt was made to show that all Texas, Mexican, or Indian cattle coming from the malarial districts during the months mentioned were infected with the disease, or that such cattle were so generally infected that it would have been impossible to separate the healthy from the diseased. Had such proof been given, a different question would have been presented for the consideration of the court. Certainly all animals thus infected may be excluded from the state by its laws until they are cured of the disease, or at least until some mode of transporting them without danger of spreading it is devised. Railroad Co. v. Husen gives no support to the contention of the defendant. There is no necessary dependence of the provisions of section 4059, imposing a civil liability, upon those of section 4058; so that the one may not stand without the other. If the criminal liability created by section 4058 is open to doubt, which we do not affirm, the civil liability may remain for the damages caused by the willful conduct designated in section 4059. Packet Co. v. Keokuk, 95 U. S. 80; Allen v. Louisiana, 103 U. S. 80. The case is therefore reduced to this: whether the state may not provide that whoever permits diseased cattle in his possession to run at large within its limits shall be liable for any damages caused by the spread of the disease occasioned thereby; and upon that we do not entertain the slightest doubt. Our answer, therefore, to the first question, upon which the judges below differed, is in the negative; that the section in question is not unconstitutional by reason of any conflict with the commercial clause of the constitution.

As to the second question, our answer is also in the negative. There is no denial of any rights and privileges to citizens of other states which are accorded to citizens of Iowa. No one can allow diseased cattle to run at large in Iowa without being held responsible for the damages caused by the spread of disease thereby; and the clause of the constitution declaring that the citizens of each state shall be entitled to all privileges and immunities of citizens in the several states does not give non-resident citizens of Iowa any greater privileges and immunities in that state than her own citizens there enjoy. So far as liability is concerned for the act mentioned, citizens of other states and citizens of Iowa stand upon the same footing. Paul v. Virginia, 8 Wall. 168. It follows that the judgment below must be reversed, and the cause remanded for a new trial.