ing hüSLs, but 1 ain lioping' to be able Lo carry aut an impor¬ 
tant experiment witli the Crithidia of a blood sucking fly, Taba- 
mis slrialiis. 
I htive now placed the study of these important flagelki- 
tes on ti scientific basis, and l hâve little doubt that the re- 
siilts obtained will be of practical value in that they will throw 
light on those formx occtirring in blood-sucking insects ; 
these j)tirasites hâve been a fruitful source of error in tire 
past. h'or instance the study of Hcrpctomonus miiscae donics- 
ticac lias suggested an important modification in further feeding 
experiments with Cimex rotuniiaiiis on cases of Kala-Azar^ which 
I hope to begin shortly. It will be remembered adult bugs were 
fed chiefly on these cases, and it was not therefore possible to 
feed them for long periods. I now propose feeding young nymphs 
immediately after they. hatcli out, and to continue doing so till 
they are adults. 1 will then begin to dissent them, and look for 
the flagellâtes of the parasite of Kala-Azar. This idea is based 
on the fact that ti few flagellâtes or cysts of H. muscae domes- 
ticae when ingested by a clean fly multiply to an enormotis ex- 
tent, and that they persist in this stage (i) for a long time provid- 
ed the food is of the right kind. 
In my paper on Herpctomonas muscae domesticae which is 
being prepared in collaboration with Mr. V. Govindaraju Muda- 
LiAR, I wdll give a minute description of the morphology and life 
history of the parasite based chiefly on a study of it in the fresh 
condition, as well as on stained specimens and sections. 1 will 
also describe a number of experimfents to shew the effect of dif¬ 
ferent foods and dyes on the stages of the parasite as well as the 
effect of variations in the température. 
In conclusion I wish to acknowledge the help 1 luave received 
from Mr. V. Govinfiaraju Miuialiar, who lias not onlv assisted 
me with the hundreds of dissections that were carried out, but 
has devoted ail bis spare time to breeding the flies wdiich is no 
small undertaking. Ahe success of each experiment depended c'd- 
most entirelv on the condition of the flies, strong vigourous in- 
(i) Since writing- the abi)ve pajier flies infected on November 26 th hâve 
been ke])t alive in the larg-e cage for 30 days and during this time the 
flagellâtes remained in the same condition. The strain of Herpetomonas 
muscae do))iesticac used in this experiment was (vbtained from fly No. 91 of 
a pre.viüus batch. It is now being passed through a third sériés of flies and 
I hope to be able to keep it continuously for at least one year. 
