410 



CHAMBERLAIN AND VEDDER. 



The more marked the shift to the left, the higher will be the index. 

 For our American series the index adopted l)y Arneth (sum of classes 

 I and II) was 46.2 which is but a little higher than the index of 40 

 found by Arneth for normal individuals in Europe. For the Filipinos 

 of our series the index is much elevated, averaging 65.8. 



Using the index adopted by Bushnell and Treuholtz (sum of classes 

 I and II and one-half of class III) there also appears a decided eleva- 

 tion for the Filipinos, average 78.7, as compared with 64.8 for Americans 

 resident in the Philippines, but the differences are not as great as when 

 the index adopted by Arneth is employed. 



THE INFLUENCE OF THE COMPLEXION OF WHITE MEN ON THEIR ARNETH 



COUNT IN THE PHILIPPINES. 



We have for eighteen months been at work on the influence of the 

 Philippine climate on soldiers of the blond an'd the brunette types of 

 complexion who have served a year or more in the Islands. By blond 

 we mean a man with light brown, sandy, red, or flaxen hair, blue or gray 

 eyes, and a light or ruddy complexion; by brunette one with dark brown 

 or black hair, brown or black eyes, and a dark complexion. Men in 

 whom eyes, hair, and complexion do not all conform to the same type are 

 classed as mixed types and excluded from consideration. The blood 

 counts considered below are from men who were pronounced specimens 

 of the type they represent. 



Table III. — Leucocyte count, differential count and Arneth's count on 28 blonds 

 and 28 brunettes resident in the Philippines. 



Complexion 

 type. 



o 

 P.S 



Differential counts, per cent. 



Arneth's classification, 

 per cent. 



c 



X 

 a 

 ■a 



G 



c 

 oi 



It 



x^ 

 ■o 



G 



o 



1 



1 

 o 

 c 



o 



O. 



. 



g 



o 

 o. 



S ■ 



c 

 o 



a 

 S 



6h 





I. 



II. 



in. 



IV. 



V. 



Blond 



Brunette __. 



7,077 55.5 

 7,888 60.2 



4.3 

 3.5 



33.0 

 29.0 



4.5 

 4.5 



1.9 

 2.1 



0.8 

 0.7 



11.5 

 14.5 



31.6 

 34.5 



38.2 

 35.7 



16.2 

 13.6 



2.1 

 1.8 



43.1 

 49.0 



62.2 

 66.8 



Tlie length of the present tour of tropical service averaged 16.5 months for 

 the blonds and 16.2 for the brunettes. If previous tours of tropical service are 

 added then the average total tropical service was 29.1 months for the blonds and 

 36.0 months for the brunettes. 



It will be observed that the pi'oportion of the polymorphonuclear 

 leucocytes (phagocytic cells) is slightly less for the blonds (55.5 per 

 cent as compared with 60.2), while the brunettes show a somewhat higher 

 index for the Arneth count, whether reckoned by the method of Arneth 

 or that of Bushnell and Treuholtz. We believe that these differences 

 are unimportant and due to the inhei'ent error attaching to such a small 



