826 
W. H. DALRYMPLE. 
at the above named temperature then loses its virulent proper¬ 
ties, and finally loses all its vitality. The preparation of the 
first or weakest lymph requires twenty-four days’ exposure ; that 
of the second twelve days ; and they are inoculated at an inter¬ 
val of ten to fourteen days. The vaccine then, is the actual 
virus attenuated or weakened until it has been deprived of its 
virulence, by e:?y)osure to the temperature above stated, in the 
presence of oxygen. The administration of this vaccine seems 
to set up a mild form of fever, which in the majority of cases is 
almost totally unrecognizable, and in so doing confers immunity 
or non-susceptibility, which lasts for a period of about twelve 
months. 
The main fact to be remembered in the sanitation of this 
disease, is, that the animal, its discharges, and all its surround¬ 
ings are, or at all events, ought to be considered, infected. If 
we bear this strictly in mind, we are more than likely to be 
guided in the prosecution of the proper sanitary measures by 
common sense and intelligence. 
In the first place, whenever the disease breaks out, the af¬ 
fected animals should be allowed to remain where they are, and, 
where at all practicable, the healthy ones should be removed to 
healthy quarters. The reason for this is obvious ; we desire to 
circumscribe the infected area and quarantine it, so to speak. 
When we remove the sick animals we simply spread the disease 
by making new centres of the contagion. We say, then, that 
the diseased animals should be quarantined where they are first 
found to be affected, if at all possible. All their surroundings, 
such as litter, excrement, etc., should be burnt. Should the ani¬ 
mal succumb to the disease, the carcass should be burnt; and if 
it is necessary to have it hauled off for that purpose, it should 
not be dragged along the ground, as is often done, allowing the 
blood from the abraded skin to contaminate the ground, but the 
body should be placed on a rough slide of some kind, made im¬ 
pervious, so that no fluid can escape from the cadaver, and when 
done with, the slide itself can be cremated also. Burying is not 
so satisfactory, for the reason that some of the infected discharges 
