56 THE DISEASES OF DOMESTIC ANIMALS. 



diseased cow." " A veterinarian had a long-continued and painful 

 eruption in the mouth from touching the internal part of the same 

 with his finger after having handled a diseased cow." 



In the " Preussische Mittheil. aus. d. thierarztlichen Praxis," 

 1874-"T5, are given three cases of aphthous eruption in the mouths 

 of men who had drunk buttermilk which had been taken from a 

 cow having foot-and-mouth disease. 



On account of the paucity of observations from competent medi- 

 cal men, little is known about the disposition of mankind to this dis- 

 ease. Doubtless, as in other infectious and contagious diseases, some 

 persons have a far greater disposition to infection than others. Bol- 

 linger says, " Notwithstanding the ruling opinion to the contrary, the 

 disease is much more frequent among human beings than expected." 



Numerous observations have been made of the synchronous en- 

 zootic eruptions of this disease among cattle and an eruption in the 

 mouth of human beings. 



The outbreak of this disease among human beings is only to be 

 prevented by competently educated and trustworthy veterinary in- 

 spectors for all dairies, and by the exact isolation of all diseased 

 animals. 



Such milk might be cooked before being offered for sale ; but 

 the danger of insufficient or neglected cooking is too great to justify 

 such a procedure, so that its sale should be strictly forbidden, and, 

 if persevered in, as strictly punished. 



Such milk, after leing thoroughly cooked, could be appropriately 

 used for feeding swine. Whether the consumption of butter and 

 cheese made from such milk is dangerous to mankind is an open 

 question requiring more extended and critical observation. 



Another subject which has not, as yet, received by any means 

 the attention which it deserves is, the changes produced in milk 

 chemically, and especially microscopically, by the presence of in- 

 flammatory conditions of the udder of the cow. 



a. The influences of such milk should be critically tested by 

 means of feeding experiments upon young and healthy animals of 

 the same and different species ; controlled by feeding young ani- 

 mals from the same mother, or of as nearly as possible like age and 

 constitution, upon the same material. 



h. Are there in such milk, from diseased udders or single cisterns 

 of the same, such microscopic changes as to allow their recognition 

 when mixed with milk from perfectly healthy cows ? 



Fiirstenberg * has gone into this subject with no inconsiderable 



* " Die Milchdriisen der Kuh," Leipzig, 1868. 



