THE COMMUNICABLE DISEASES 
531 
produce decided changes in that of tuberculous animals. 
The reaction in the tuberculous animals may assume 
several characters, of which usually two are combined 
in a chart. The commonest and most convincing is a 
definite rise in the first twelve hours, amounting to one 
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Chabt H. Composite chart of eleven non-tuberculous Ateles. 
degree or more ; rarely it may be three degrees ( W) . This 
is followed either by a maintenance of a liigh level or an 
attempt to perform the night drop. It may be said that 
in general there is an abortive attempt in nearly all tuber- 
culin reactions to simulate the V of the normal cycle ; this 
can be seen in charts M, N, and P. Another rise may 
be attempted during a similar period of the second twenty- 
four hours or the whole course may at that time approxi- 
mate the normal. A modification of this type of reaction 
