460 The Philippine Journal of Science 1923 



detect and treat as many types of parasitic infestation as pos- 

 sible, and to discover the light as well as the massive infections. 

 The protozoan findings are subject to the usual error arising 

 from a limited number of examinations and, as the majority 

 of the subjects were microscopically examined only once before 

 treatment, no numerical value can be placed upon them. 



Cover-glass preparations were made from each stool, and a 

 sample was concentrated by the Cropper and Row ether-centri- 

 fuge method. In the entire group of subjects, there were only 

 two who yielded hookworms on screening, the ova of which were 

 not found before treatment. These two subjects yielded one 

 and seven worms, respectively, on screening. 



On the other hand, several exceedingly light infestations were 

 detected microscopically, as is shown on surveying the cases 

 from which ten worms or less were recovered on screening. 

 These cases are recorded in Table 1. 



Table 1. — Subjects harboring ten hookworms or less. 



Examinations of the blood and urine were made by the usual 

 methods. Hsemoglobin estimations were made with the Tall- 

 quist scale. None of this work was intrusted to laboratory 

 technicians. Blood pressures were recorded with the Tycos 

 apparatus. 



A separate cell house was set aside for the accommodation 

 of the men under treatment, and as soon as the drug was ad- 

 ministered the water-closets were sealed to avoid loss of stools. 

 Each man was furnished with a separate "jerry" which was 

 marked with his number and name, and an attendant was told 

 off to see that each man used his own receptacle. 



On the night before treatment the men were given soft diet. 

 This was done principally to lighten the work of screening the 

 stools. Breakfast and luncheon were withheld and the drug 



