1909. ] TUBERCULIN TEST IN MONKEYS. 89 
temperatures, and a few notes may be given consistently with the 
purpose of this paper, together with a list of temperatures that 
have been taken with a view to possibly more extended work with 
tuberculin. 
By artificially causing monkeys to turn night into day in all 
that concerned their activity, Simpson and Galbraith reversed the 
daily curve of temperature, the low point occurring in the after- 
noon, the high point in the early morning. This result, together 
with the irregularities we have found in diurnal lemurs, led me to 
observe the course in two nocturnal species : Perodicticus potto, in 
which the record for twenty-four hours proved to be: 3 P.M., 
OAC (ee vee 99:22- il pew, LOO? 5 tou Aa 90c8 ain ieAeMe,) OO: 
11 a.m., 97°6°; 3 p.m., 97°8°: and Galago senegalensis, in which 
the 3 p.m. record was 100°6°, the 3 a.m. 102°6°. A single observa- 
tion previously made on Galago crassicaudatus at 3 P.M. gave 
98°8°. This being low for primates, it is probable that it is near 
the minimum point in the daily curve of this species also, and 
that the record obtained from the Potto represents the normal in 
nocturnal lemurs, corresponding in its main features with Simpson 
and Galbraith’s reversed curves in monkeys, the chief difference 
being that both high and low points come rather earler. 
It seems, therefore, that the temperature drop in primates is an 
easily induced physiological result of decreased activity, which 
reaches its lowest limit during the period habitually allotted to 
sleep, and that the above condition should also be true of the 
night-monkeys, Wyctipithecus, but conclusions from five records 
taken from two examples of JV. trivirgatus, about 3 P.M., are 
obscured by their irregularity. These were 102°2°, 101-5°, 100°, 
99-8°, 99:4°. Further investigation of the complete curve in this 
genus will be of interest when occasion offers. 
The temperatures following were taken with tested thermo- 
meters, and nearly all were checked by three observers. Whether 
or not, or to what extent, they were affected by excitement, as in 
monkeys, can be determined only by a more extensive series of 
observations than we have yet been able to undertake. The 
records were taken between 10 A.M. and 4 p.m. The temperature 
of the building in which the kangaroos were kept was 50°, the 
others ranged from 63° to 67°, but, excepting primates, within 
these limits neither the hour nor the surrounding temperature had 
any perceptible influence in the many cases where the same 
animal was tested repeatedly under different conditions. 
Bearing in mind, however, the reversed daily curve in night- 
lemurs, it is significant to observe that animals of known nocturnal 
habit, such as Cercoleptes, Arctictis, Paradoxurus, and Mephitis 
among carnivores, and Peromyscus, Dipodomys, Capromys, and 
Dipus among rodents, give afternoon temperatures distinctly 
lower than is common in diurnal species of their respective 
orders. 
