450 CHAMBERLAIN. 



uote that for eaeli of the above 7 symptoms, except anexoria, the inci- 

 dence per mile in the S-C-P-Gronp was higher for the mixed types 

 than for the blonds. 



Influence of direct sunlight. — ^^In both groups the number per mille 

 of blonds who stated that direct sunlight affected them unpleasantly 

 was slightly greater than that of the brunettes, but the differences were 

 immaterial. Again it happened that the mixed types who made com- 

 plaint were in excess of the blonds. The special symptoms asked about: 

 namely, vertigo, headache, nausea, vomiting, photophobia, excessive thirst, 

 and excessive redness of the face, were all somewhat more common among 

 the blonds than among the brunettes of the 1910-Group, while in the 

 S-C-P-Grroup the results were similar except for photophobia and ver- 

 tigo, the former being slightly and the latter two and one-half times 

 more common among the brunettes. Several of these symptoms were 

 of more frequent occurrence among the mixed types than among the 

 blonds. 



General symptoms. — Lassitude on arising in the morning was slightly 

 more common among the brunettes of the 1910-Grronp and among the 

 blonds of the S-C-P-Group, but in this latter group the mixed types were 

 much more affected than the blonds. Both irritability and depression 

 were equally common or more common among the brunettes than among 

 the blonds in each group. Both of these sensations were far more fre- 

 quent among the mixed types than among the blonds of the S-C-P-Group. 



Dietary and siesta habits, and maintenance of weight. — The numbers 

 per thousand who ate the same amount and kind of food as at home was 

 slightly less for the blonds than for the brunettes in both groups. In 

 the 1910-Group increased consumption of food in the Troj^ics was more 

 common among the brunettes, while in the S-C-P-Group there was no 

 appreciable difference. The numbers of men per mille in the S-C-P- 

 Group who lost weight were equal for the two complexion types, and 

 there was no material difference in the numbers of those who gained 

 weight. In other words complexion did not influence the weight in the 

 S-C-P-Group, and it has been shown in Tables V and YI that the same 

 was true for the 1909-Group and the 1910-Group. In both groups the 

 siesta habit was very much more frequent among the brunettes. For 

 the mixed types it was even more common than for the brunettes. 



SUMMAKY OF PART IV. 



Summing up the subjective evidence contained in Talkie XXIII it 

 may be said that for the 1910-Group, with its 18.5 months of tropical 

 service, the differences are so slight and so variable for the two types 

 that no clear distinction can be made out in the climatic effects produced 

 on the blonds and on the brunettes. In the case of the S-C-P-Group, 



