100 



GIBBS. 



These three subjects represent the extremes and a mean of 

 skin pigmentation. The Negro is quite black, the Tagalog 

 brown, and the Caucasian white. There was no greatly marked 

 difference in the temperatures of the Caucasian and the Tagalog. 

 The Negro showed distinctly higher temperatures throughout 

 the investigation, but it is to be noted that the white skin rises 

 more rapidly than the brown. After this initial rise, on placing 

 in the sun, the brown skin maintains a slightly higher tem- 

 perature than the white. 



In the investigation, the subjects were kept in the shade until 

 stripped to the waist and the shade measurements taken. So 

 soon as the initial measurements were made, the subjects were 

 seated in the sun side by side with their backs directly exposed. 

 The Tagalog was in the habit of wearing clothes to the same 

 degree as the others. 



The temperature, humidity, and amount of sunshine recorded at Mira- 

 dor Observatory, Baguio, on the five days during which the above experi- 

 ments were conducted are given in Table V. 



Table V. — Temperatures and amounts of sunshine recorded at Mirador 

 Observatory, Baguio, for days of experiments. 



Maximum tempera- 

 tures by mercury 

 thermometers. 



April 29 

 May 3.. 

 May 4.- 

 May 17- 

 May 20, 



1.00 

 12.05 

 11.10 

 11.55 



9.55 



Under 

 shelter. 



23.7 

 23.0 

 24.6 

 •24.0 

 24.4 



Black 

 bulb. 



52.9 i 



5?.l 



50.9 



52.4 



50.7 



Clear 

 bulb. 



27.5 

 26.2 

 27.4 



28.4 

 27.4 



Relative 

 humidity 

 (mean) . 



89.3 

 90.4 

 74.9 

 83.2 

 77.2 



Amount 



of 



sunshine 



during 



the day. 



h. m. 



The sunshine record, made by the Friez Quadruple Register, can not 

 be regarded as being of much value. Light clouds which would interfere 

 seriously with my work are often not recorded by this instrument. In 

 fact at this season at Baguio, I had difficulty in finding a sufficient 

 number of hours of good uninterrupted sunshine to carry on the meas- 

 urements given in this article. 



My Baguio observations on the temperature under the hair 

 of the head resulted as did those of Aron, obtained in Manila. 

 This question is so closely governed by the idiosyncracies of each 

 individual case that I believe the results are of no value for 

 comparative purposes. In the full sun, I see no reason for 

 doubting that the variations will be slight for the same individual 

 in different localities, provided the air temperatures do not vary 



