26 The Philippine Journal of Science 191s 



In Table XIV dissections at later periods of 101 mosquitoes 

 are compared with respect to different stages of development 

 of the parasites. Only positive specimens are included, and in 

 nearly all cases at least ten days had intervened between feeding 

 and dissection. In cases where cages had been exposed two 

 or more times, the time in days is given as definitely as possible. 

 For example, the entry "11-11.5" means that the mosquitoes 

 were fed on the carrier on the evening of one day and again on 

 the morning of the next and that 11-11.5 days intervened be- 

 tween those dates and dissection. All positive cases of all 

 species dissected ten or more days after feeding are included in 

 this table. 



In Table XIV we note that the first appearance of sporozoites 

 in the gut was eight days after feeding. The species was rossi, 

 and it had been given one feeding on a crescent carrier. The 8- 

 to 12-day sporozoites in the gut of ludlowi was probably benign 

 tertian, and the 4- to 8-day sporozoites in the gut of barbirostris 

 probably benign tertian as well (see under Table V) . The first 

 appearance of sporozoites in the salivary glands, twelve to 

 twelve and one-half days, was in a group of rossi infected by 

 a crescent carrier (No. 537, Table XI). The 12- to 16-day ap- 

 pearance of sporozoites in kawari followed feeding with crescent 

 carrier 1997 (Table IX). In the case in which sporozoites were 

 found in the salivary glands twenty-five to twenty-five and one- 

 half days after feeding (twenty-five days after the last feeding, 

 crescent carrier 537), sporozoites were found in the salivary 

 glands of another specimen of the same feeding that was dis- 

 sected nine days previously. In another lot fed on the same 

 crescent carrier eleven days intervened between the first and the 

 last finding of sporozoites in the salivary glands. We have here 

 some data as to the length of time sporozoites may remain in 

 the salivary glands. 



We note in this table the large proportion of dissections, many 

 of them long after the time of infection, in which only degenerate 

 or much retarded oocysts were found. In practically all such 

 cases the salivary glands were examined and were always found 

 negative. The evidence for abnormality in these oocysts is based 

 not only on retardation of growth, but also on their appearance. 

 Abnormal vacuolization and watery or coarsely granular pro- 

 toplasm were sometimes seen, and in some cases the oocyst not 

 only remained small after a long period, but also gave the im- 

 pression of an encysted body. In only one or two cases were 

 the oocysts themselves parasitized by "black spores" or by some 

 similar organism. 



