PRIZE ESSAY. 
395 
of opinion that there is only one mode of inoculation, and shall 
now describe it. 
“ The virus or lymph should be obtained from an animal not 
too far gone in the disorder and free from other diseases. 
“ Lymph ” is the amber-colored liquid exudate found in the in¬ 
terlobular tissue (described previously as clear exudation . See 
page 13). It may be obtained by cutting into this clear exudate 
and allowing it to drain into a vesseJ below. Too much care can- 
not be exercised in selecting the lymph, as its fitness is the most 
important thing in connection with the operation. Select and 
use, therefore, only the amber-colored liquid free from blood, 
serum and other extraneous matter. If not used immediately, 
preserve it by hermetically sealing the bottle. 
“ Having obtained your lymph, you saturate with it as many 
pieces of white worsted, eight to nine inches long each, as there 
are animals to operate on. The instruments used are a pair of 
strong clipping scissors, a pair of rowelling scissors, and the 
needle. 
“ The proper place to inoculate is the tip of the tail. 
“ In operating you require the assistance of two men and a 
lad; one man to hold the head, one to distract her attention be¬ 
hind with one hand, while with the other he grasps the tail 
firmly, while the lad holds the saucer containing the threads 
ready saturated for use. 
‘‘ The operator, standing behind the animal, seizes the end of 
the tail and clips off the hair for five or six inches, only leaving a 
tuft at the end. Then with the rowelling scissors he makes the 
transverse cuts on the posterior aspect of the tail, three inches 
apart. 
“ The needle is then passed from below out at the upper cut, 
turned round several times sharply to enlarge the channel, 
threaded with a doubling of the worsted and then carefully with¬ 
drawn, leaving the thread in the tail; and after cutting off the 
two long ends the operation is complete. 
“ Within two or three days after inoculating, the part be¬ 
comes slightly swollen, erythematous, but there is no discharge 
from the orifice. The swelling increases, and the animal is not 
