164 
J. LAW. 
these products from infected localities are likely to be sent to 
a distance, it seems probable that cases of milk sickness occur, 
especially in the large cities, without any recognition of its true 
nature. A thorough course in comparative pathology would en¬ 
able the physician to recognize these more readily, and to inter¬ 
dict such dangerous articles of food, through the agency of the 
city boards of health. 
Vegetable Parasites on the Surface. —Of other vegetable para¬ 
sites there need only be mentioned those productive of the differ¬ 
ent forms of ringworm, all of which exist in the domestic animals, 
and those causing thrush in the mouth of young animals. If the 
practitioner, medical or veterinary, is unacquainted with the hab¬ 
its of these parasites on animals and vegetables, he is not likely 
to prove a satisfactory sanitary adviser, however successful he 
may be in destroying the parasite in the individual case. 
Entozoa. —Of entozoa or worms, man reciprocates with the 
domestic animals in entertaining at least six different species of 
tapeworms , some of them like echinococcus , productive of much 
suffering, and a fatal result in many cases; of one trunalode or 
fluke , and of three round worms , including the deadly trichina. 
Epizoa. —Of animals that live on the surface, no less than a 
dozen species are common to man and the domestic animals, and 
though these are not usually dangerous to life, yet they will, in 
some instances, prove most inveterate and indestructible, and 
condemn their victim to a most miserable existence. 
This hurried and imperfect notice of the maladies common to 
man and animals will serve to illustrate how much is lost by the 
separation of the two fields of medicine, human and comparative. 
If the above remarks have seemed to reflect unduly on the aver¬ 
age medical practitioner, it is in no invidious spirit, but only 
because the object of the present paper is to show how much the 
medical profession may gain from a closer association with com¬ 
parative pathology, and especially with veterinary medicine. Such 
a connection would accrue even more to the profit of the veteri¬ 
narian, alike in giving him the status that lie ought to possess, and 
in furnishing him more thoroughly for the practice of his profes¬ 
sion. The average veterinarian is, to say the least, no better in- 
