THE COMMUNICABLE DISEASES 
535 
appearance of the non-sensitivity and allows any latent 
tuberculosis, possibly stimulated by the toxin, to develop. 
Repetition upon the same monkey has occurred as high 
as ten times without apparent harm. 
There are sometimes in human beings local reactions 
at the point of injections. These have been entirely lack- 
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Chart L. POTTO (Perodicticua potto). Healthy. 
ing from our monkey specimens. Nor have we ever seen 
secondary tuberculous lesions appear at the point of the 
needle-stick. Aseptic syringes and generally cleanly tech- 
nique have also protected against local abscesses. When 
an animal is injected he may scratch or pick at the spot 
for a minute or two but thereafter seems to ignore it 
entirely. 
