J. LAW. 
160 
inarians on domestic animals, and afterward appropriated for the 
relief of man. 
When we enter on the list of contagious and parasitic diseases, 
we are at once brought face to face with a sanitary question of 
supreme importance alike to man and to his living possessions. 
Several of the specific and contagious diseases of animals are com¬ 
municable to man, with a more or less deadly effect. Many, also, 
of the parasites of animals inhabit the human body as well, and 
the result of their entertainment is not unfrequently fatal to the 
human bearer. As both the contagious and parasitic diseases are 
propagated by germs produced in countless numbers in the body 
of the victim, it follows that the aggregation in a limited area of 
men and animals, in which they can live'and increase enormously, 
enhances the danger to both kinds of victims. If physicians are 
left ignorant of the affection in the beast, and veterinarians of the 
same in man, they each miss the golden link which would reveal 
the true nature and dangers of the disease, and enable them to 
contend with it successfully. 
SPECIFIC DISEASES COMMON TO MAN AND ANIMALS. 
Without entering extensively upon the subject, I will note a 
few of the more fatal diseases in which men and animals 
reciprocate: 
Asiatic Cholera .—The implication of domestic and wild ani¬ 
mals in this disease, lias been extensively observed: In India, by 
Annisley, Tytler, Jamison, Searle, Chalmers, Rankin, Orton, Bar- 
rand, and others, and in Europe by Jsenichen, Kleinert, Cohen, 
Hensinger, Carrere, Hildebrand, Hering and JDick. Recently 
Thiersch, Burdon, Sanderson, Crocq, and others, have investi¬ 
gated the disease, producing it experimentally in a great number 
of mice, guinea pigs, hedgehogs, pigeons and dogs. These experi¬ 
ments on the lower animals have served to clear up the nature of 
the disease, and to suggest a rational treatment, and, above all, a 
sound system of prevention which no observation of the malady 
in the human subject alone could have furnished. The physician 
who neglects such light, and coniines his observations to the 
human patient, is an unsafe guide, whether in the sick room or as 
a sanitarian. 
