240 
Drug Treatment of Redwater 
is less active than the canine both as to movement and rate of 
multiplication. 
The signs, used in our protocols, have the following signification:— 
The sign stands for a corpuscle containing 
(0) 1 rounded, ovoid, pyriform, or irregular parasite. 
(PP) 2 pyriform parasites. 
(D) 1 dividing form. 
The brackets () represent the corpuscle ■which contains the parasites. 
The abbreviation r.b.c. stands for red blood-corpuscle. 
The sign -f in the protocols denotes that the number of infected r.b.c. etc. was too 
small to determine the percentage. 
The percentage of infected corpuscles in our untreated cattle never 
rose to the height observed in dogs. On the other hand, whilst the 
highest percentage of (D) encountered in dogs was 5—6 °/ 0 , these forms 
at times occurred in 16 °/ 0 of the parasitized corpuscles in cattle. The 
following table summarizes the observations above-mentioned: 
Cow No. 
The maximum 
% of infected 
r.b.c. observed 
The maximum 
o/o of (O) 
forms observed 
Haemoglobinuria 
+ present 
0 absent 
Cow X 
0-8 
4 
0 
Control I 
5-0 
13 
+ (died) 
„ II 
006 
8 
0 
„ III 
0-2 
16 
0 
.. iv 
4-6 
14 
T 
That the percentage of infected corpuscles may occasionally be large 
is shown by the counts we made on blood films from Heifer 182 (see 
p. 243). In this case 58'2°/ 0 of the corpuscles contained parasites on the 
day it died. This animal had haemoglobinuria. 
Owing to the fact that we have included (P) forms under class (0) 
the percentage of the latter is usually in excess of the (PP) forms. 
The percentage of (PP) forms may, however, vary in individual cows at 
different times, as is shown in the following table: 
Cow X .. 
Control I 
„ II 
„ HI 
„ IV 
Heifer 182 
And before treatment in 
Cow 1 ... 
2 
»» ^ • • • 
„ 3 ... 
4 ... 
Percentage of (PP) 
varied between 
52 and 36 
48 
43 
38 
48 
36 
33 
29 
16 
31 
19 
(died) 
42 
52 
53 
37 
43 
33 
41 
27 
33 
30 
