﻿234 The Philippine Journal of Science 1914 



The conditions limiting the work were as follows : 



1. One cover-slip preparation was examined of the one spec- 

 imen obtained from each case. 



2. The majority of the examinations were made by Filipino 

 "trusties" under the supervision of various members of the 

 biological laboratory, Bureau of Science (Drs. P. E. Garrison, 

 Y. K. Ohno, F. B. Brown, Liborio Gomez, and D. G. Willets). 

 The findings are, therefore, not as exact as they would have 

 been if the examinations had been made by more experienced 

 individuals. 



3. Examinations were made within seventy-two hours of 

 admission. Since travel from sections of the Islands which are 

 most remote from Manila practically never requires more than 

 three weeks and since about one month after the date of infec- 

 tion with the several species of parasites concerned is necessary 

 for evidences of them to appear in the faeces, it may be considered 

 that the positive results obtained indicate infections which the 

 individuals examined possessed when they started for the 

 prison. Protozoan findings were excluded because they may 

 have been contracted en route. 



4. None of the individuals examined had been an inmate 

 of the prison previously. All of them were adult males. 



The results obtained are given in Tables I, II, III, and IV. 

 They may be compared with those of similar investigations in 

 the Philippines by consulting tables prepared by me.^ In making 

 comparison, it should be noted that the majority of the series 

 of cases studied are composed of males and females, as well 

 as adults and children of given communities. 



Garrison ^ examined Bilibid prisoners, and a summary of his 

 helminthic findings is given in Table V. The percentage of 

 persons harboring Trichuris, Ascaris, and hookworms differs 

 greatly in his series of cases and mine. 



The cause of these variations cannot be due to any great 

 extent to the personal equation entering iijto the examinations, 

 because the ova of Trichuris, Ascaris, and hookworms are easily 

 recognized by one seeing them daily,* nor can it be due to any 

 change outside of the prison, for a greater percentage of the ad- 

 mission cases of 1910 were infected than those of 1908. It is 

 probable, therefore, that the variations are due to conditions 

 within the prison at the time Garrison made his examinations 



^This Journal, Sec. B (1911), 6, 77. 



*Ibid. (1908), 3, 1911. 



* For instance, the "trusties" already mentioned. 



