Ct. H. F. Nuttall 
319 
I am not cleai' as to the position of a considerable number of parasites 
in different animals and which have been referred to the genera 
Piroplasma, Theileria, Achromaticus and Microsoma by various authorsi 
These parasites I’ecpiire further stud}’ before they can be definitely 
classed. 
Treatment and Prevention, 
In concluding, I must mention the subjects of treatment and 
prevention. The only drug hitherto discovered which exerts an infiuence 
on some of the parasites I have described is Trypanblue^ a dye which is 
administered intravenously in preference to subcutaneously in l-l’.5“/o 
Fig. 14. Showing the effect of Trj’panblue upon Piroplasma canis in the peripheral blood 
of a dog: (1-4) normal types of parasites ; (5-12) parasite.s from the same dog, 
showing progressive degrees of degeneration in blood removed from the dog’s ear-vein 
si.'c hours after the injection of the drug. (Nuttall, 1910.) 
aqueous solution. A dose of 5-10 c.c. is curative for dogs suffering from 
Piroplasma canis infection, and the drug is being used to-day in many 
parts of Africa where it was previously impossible to keep dogs. 
* Nuttall and Hadwen (1909). 
