﻿432 



The Philippine Journal of Science 



1914 



fore, while much fewer of the salt water forms were dissected, 

 the percentage of infections in the mosquitoes from the two 

 sources was practically the same. 



INFECTIONS WITH THE DIFFERENT SPECIES OF MALARIAL PARASITES 



The number and percentage of infections obtained with the 

 parasites of subtertian, tertian, and quartan malaria in the 

 different species of anophelines are given in Table XII. 



Table XII. — Infections with the different species of malarial parasites. 



Species. 



Plasmodium prxcox (.falciparum) : 



Experiments 



Mosquitoes dissected 



Mosquitoes infected — 



Number 



Per cent 



Plasmodium, vivax: 



Experiments 



Mosquitoes dissected 



Mosquitoes infected — 



Number _ 



Per cent ._ 



Plasmodium malaria-: 



Experiments _ 



Mosquitoes dissected 



Mosquitoes infected- 

 Number 



Per cent.. 



A. febri- 

 fer. 



A. rossii. 



A. barbi- 

 rostris. 



A. sinen- 

 sis. 



A. macu- 

 lattts. 



Total. 



66 



91 



48 



5 



18 



228 



320 



546 



181 



18 



45 



1.110 



132 

 41.25 



57 

 10.43 



7 

 3.86 





 



3 

 6.66 



199 

 17.92 



3 



17 



5 







1 



26 



13 



75 



11 







4 



103 







6 















6 







8.00 















5.82 



9 



8 



7 











24 



40 



21 



13 











74 







































« 











In .this table the total number of experiments with the sev- 

 eral species of mosquitoes exceeds the number of experiments 

 recorded in Table II because many of the cages contained more 

 than one species of mosquito. While nearly as many patients 

 with tertian (7) as with subtertian (8) malaria were used 

 in our experiments, a much smaller number of experiments 

 was made and mosquitoes dissected in the case of the tertian 

 type of malaria. This is due chiefly to the fact that the gametes 

 are much less persistent in tertian than in subtertian malaria. 

 In the case of quartan malaria only two patient were available 

 for experimentation. Moreover, both the tertian and the quar- 

 tan patients happened to be available either early in our investi- 

 gation before our technique was well developed or during the 

 time when unusual mortality was occurring among our mos- 

 quitoes. Therefore, our data with reference to infections with 

 the tertian and quartan parasites are not so complete as desired. 



