INFLUENCE OF PHILIPPINE CLIMATE ON WHITE MEN. 453 



On examining the total numbers of each type invalided home from 

 all causes (which have been reduced to a percentage basis in the last 

 line of Table XXV) one immediately notices that the proportion of 

 mixed types is considerably lower than was the case among the 10,072 

 men taken as a standard. Turning to the blonds and brunettes it is 

 seen that the ratio is 100 to 126, whereas the ratio of blonds to Inamettes 

 among 10,073 soldiers was 100 to 86. In other words while the blonds 

 exceed the brunettes in the general military population the reverse is 

 the case in the total of invalided meif. This is strong evidence that the 

 blonds do not suifer unduly from the influence of the climate, but is 

 at variance with the evidence adduced in Part III showing that there 

 is more siclmess among the blonds than among the brunettes. 



On considering the special causes of incapacity it is seen that tuber- 

 culosis heads the list in importance, and shows a larger rate for brunettes 

 than for blonds. In both nervous and mental diseases the rate is much 

 higher for the brunettes. Xeurasthenia, which especially has been at- 

 tributed by some to the influence of the tropical sunlight, was nearly 

 twice as frequent a cause of incapacity for the brunettes as for the 

 blonds, and the same was true for intestinal and kidney diseases. Vene- 

 real diseases, gout and rheumatism, pulmonary troubles, accidents, and 

 miscellaneous affections were all higher for the brunettes. Only in cir- 

 culatory and blood diseases, alcoholism, malaria, and disturbances of 

 the special senses were the blonds the greater sufferers. 



We would not argue from such a comparativel}^ small series that the 

 blonds are better able to withstand a tropical climate than are the bru- 

 nettes, but we do consider that Tables XXIV and XXV indicate that they 

 are fully as resistant to the Philippine climate as are their darker skinned 

 companions. 



RATIO BETWEEN THE THEEE TYPES IN SCOUT-CONSTABULAKY-POLICE-GEOUP. 



The members of this group have voluntarily elected to reside in the 

 Philippines, usually after having had some preliminary experience with 

 the climatic conditions. Many of them have been in the. Archipelago for 

 twelve or thirteen years and the average lengih of continuous tropical 

 service is 5.5 years. Xearly all of the Scout officers and the policemen 

 originally came to the Archipelago as enlisted men in the Army, and a 

 good proportion of the Constabulary officers also' were drawn from tliat 

 class. If the climate of the Philippines affected blonds more seriously 

 than brunettes we should expect that after several years' residence the 

 ranks of the blonds would be depleted by death, invaliding, and voluntary 

 departure, and that the ratio of blonds to brunettes would be lower 

 than the same ratio among the enlisted men (Table XXIV) from whom 

 the S-C-P-G-roup sprang. Such is not found to be the case. Among the 

 568 men of the S-C-P-Group there were 186 blonds, 147 brunettes, and 



