514 CHAMBERLAIN, BLOOMBERGH, AND KILBOURNE. 



(8) This rediiction in the number of polymorphonuclear phagocytic 

 elements in the blood is both relative and absolute and may possibly be 

 a factor in the lowered resistance to certain infectious diseases seen in 

 tropical peoples. 



REFERENCES. 



(1) U. S. Bureau of Census Pub. (1905). 



(2) Beast, R. B. The Benguet Igorot, This Journal, Sec. A (1908), 3, 413. 



( 3 ) Garrison, Letnes, and Llamas. Medical Survey of Taytay, This Journal, 

 See. B (1909), 4, 257. 



(4) Guerrero and Sevilla. Ibid., 273. 



(5) Phalen and Nichols. Distribution of Filaria in the Philippine Islands. 

 Ibid. (1909), 4, 124. 



(G) Chamberlain, W. P. Uncinariasis in U. S. Army. Arch. Int. Med. 

 (1909), 4, 8. 



( 7 ) Bowman, F. B. Observations on Parasitic Infections among Igorots. Bull. 

 Manila Med. Soc. (1910), 2, 75. 



(8) Wickline, W. A. Effects of Tropical Climate on White Race. Military 

 Surgeon. (1908), 23, 282. 



(9) Craig, C. F. The Malarial Fevers. New York (1909), 22S. 



