Gr. H. F. Nuttall and S. Hadwen 
167 
Record of Dog 11. 
Intervals of 4 i hours 2-J hours 2 hours 2£ hours 2J hours 
%of(PP) 105 125 T 55 1G 3-7 0 
% of infected r.b.c. l'l 3-8 3-7 3-6 1-4 4* 
Note :—The °/ 0 of infected r.b.c. fell slowly in this ease and at a later period reached 0. 
The high °/ 0 marked by * was due to massage of the ear. 
Record of Dog 4. 
Intervals of 2 hours 3 hours 3 hours 3 hours 3 hours 
°/ 0 of (PP) 100 69 T 1 1 1 0 
°/ 0 of infected r.b.c. 3-5 3-4 1-2 0 8 0-4 ? 
Record of Dog 3. 
Intervals of 2 hours 3 hours J hour 2J hours 
% of (PP) 92 62 T 0 3 0 
°/ 0 of infected r.b.c. 0 - 2 ? ? ? ? 
Even in the case of Dog 12, where Trypanblau was given only 3 hours 
before death took place from piroplasmosis, the drug exerted an effect 
upon the parasites, for of 100 parasites counted immediately before the 
injection of the drug 57 - 5°/o were (PP) and 32 - 5 °/ 0 were (O), whereas 2f 
hours after the injection there were only 22-J-°/o (PP) as against 77^°/o (O) 
found in the blood films. 
In the following tables we give a summary of the effect of Trypan¬ 
blau (TB.) and Trypanrot (TR.) upon Piroplasma canis, citing only 
the experiments where accurate counts were made of the different types 
of parasites. 
In Table I, the number of the dog, its description and weight are re¬ 
corded in the first column. In the second column is given the dose of 
the drug which was injected into the dog, the dose being reckoned per 
ounce (= 28 - 35 grammes) of dog in terms of saturated watery solution. 
In the third column is given the percentage of infected corpuscles, 
the counts having been made immediately before the injection of the 
drug. In the fourth column is given the reduced percentage of infected 
corpuscles consequent upon the injection of the drug, the times when 
these counts were made being reckoned from the moment when the 
drugs were injected. Where the sign occurs in the fourth column, 
it means that the number of parasites was so small as to exclude the 
possibility of determining the percentage of infected corpuscles, for the 
