?m 



The Philippine Journal of Science 



agricultural occupation on the side. We also doubt if our 

 "merchant" spent a great deal of time in his counting house. 

 However, wethink that the allotment of seventy-two men to the 

 class of laborers is substantially correct. Sixty-seven of these 

 men were infested with hookworms. 



On screening the stools of these men, we recovered 2,546 

 hookworms, of which 2,070 were Necator americanus and 476 

 Ancylostoma duodenale. Only 2 pure Ancylostoma infestations 

 were found, while there were 20 pure Necator infestations. We 

 failed to recover worms from the stools of six men. 



The worm counts in the various groups are presented in 

 Tables 20, 21, and 22. They are correlated with the age and 

 place of residence of each man. We believe it would be unprofi- 

 table at this time to discuss the occupational incidence in this 

 series, for proper interpretation of the figures presupposes fuller 

 information regarding local soil and meteorologic conditions 

 than is yet in our possession. Certain anomalies in our tables 

 will be quite apparent to those familiar with the occupational 

 phases of hookworm survey work. 



Table 20.— Hookworm counts on laborers in relation to age 

 residence. 



Year,, 

























26 



.... do 

















do 



























32 



do._ . 







24 



do .. 



















* 



do 



