﻿168 



The Philippine Journal of Science 



1914 



ber, only 100 leucocytes were counted. Therefore, the results 

 can be considered only as roughly approximate. The white cor- 

 puscles were classified in these counts as polymorphonuclear 

 neutrophils, polymorphonuclear eosinophiles, large mononu- 

 clears, and lymphocytes. Among the large mononuclears were 

 included the transitionals and myelocytes. 



In Table II are summarized the results of the examinations of 

 blood smears from 1,095 persons for malarial parasites. In 

 this table these persons are classified as well men, well women, 

 well children, and fever patients. By "well" is meant persons 

 who were up and about, performing their regular duties. 



Table II. 



-The results of the examination of the blood of 1,095 persons for 

 malarial parasites. 





Well 

 men. 



Well 

 women. 



Well 

 children. 



Fever 

 patients. 



Total. 





978 



333 



133 



189 



9 



43 



645 



34.05 



63 



14 

 7 

 9 



23 



10 

 5 



31 



16 



10 



11 







6 



15 



51.61 



1.095 



373 



167 



216 



9 



56 



722 



34.06 



Positive: 



Total _ 









! 



2 2 



49 13 



22.22 1 43.48 





Negative.-- __ 











Malarial parasites were found in 373 or 34.06 per cent of the 

 1,095 persons examined. If we exclude the 31 persons who were 

 ill in bed with fever, the percentage of apparently well persons 

 who were harboring malarial parasites in their blood is not 

 materially altered, being 33.55 per cent. Since only one blood 

 examination was made of these persons and since malarial para- 

 sites are not always present in the peripheral circulation in 

 sufficient numbers to be seen microscopically, it is probable that 

 the true percentage rate is higher than 33.55. 



This investigation was carried on in the dry season. The lack 

 of rain together with the efforts of the sanitaiy officer in charge 

 had reduced the mosquitoes within the boundaries of the estate 

 to a minimum. With the advent of the rainy season, it is doubt- 

 ful whether this condition could be maintained. Consequently, 

 the incidence of infection at the time of these examinations was 

 probably at its minimum. 



The parasite rate obtained from the examinations of the blood 

 of varying numbers of individuals has been reported from differ- 

 ent regions, but in most cases this rate has been for endemic 



