Fooi-and- Mouth Disease. 459 
ments of the minute bodies wliich are so constantly present. 
Of the ieleterious effects of the milk of diseased cows upon the 
No. 3. 
Microscopic appearance of milk in the advanced stage of foot-and-mouth disease, showing, besides 
the smooth circular milk corpuscles, large dark granular cells, many chain-like bodies (vibriones) 
and moving bodies composed of two elliptical linki (bacteria). MagniBed 400 diameters. 
systems of other animals no doubt can be entertained. Sucking 
calves have been frequently poisoned by it even before the cow 
gave evidence of the disease, which then existed in the incubative 
stage. Pigs have been repeatedly infected by the milk when 
given to them warm from the cow, but the injurious qualities 
seem to be modified by boiling the fluid or keeping it for some 
time before it is used. Undoubtedly the safest course is to 
destroy it ; but, if this is not done, it should not be given to 
pigs or other animals until it has been well boiled, and then 
allowed to get cold. As to the use of the milk for human con- 
sumption, it is sufficient to say that no one who had seen the 
fluid under the microscope would patiently contemplate the 
possibility of its being employed for the food of man, putting out 
of the question any risk of the disease being communicated to 
human beings by such means. 
In its uncomplicated form foot-and-mouth disease ends in 
restoration of a healthy condition of the affected parts, and of 
the system generally, in a week or ten days ; but various cir- 
cumstances tend to retard its favourable course : unsanitary 
influences, existence of other diseases, debility, bad treatment, all 
