G. H. F. Nuttall and S. Hadwen 
241 
In all the untreated cases of redwater which we have studied the 
(PP) forms were seen, as in dogs, to persist in the blood up to the death 
of the animals (see Control I, p. 244; Heifer 182, p. 243), or else they 
disappeared simultaneously with the (0) forms when the parasites 
vanished and recovery took place (see Cow X, p. 242 ; Controls II—IV, 
pp. 245 et seq.). 
In our untreated cows the parasites were observable microscopically 
in the blood for four to six days, after which they could not be detected 
for two to 11 days: 
Parasites found microscopically 
in blood-films during 
After which they 
disappeared for 
Cow X 
Control I (died) 
>> 
»» 
II 
III 
IV 
4 days 
4 „ 
11 days 
8 
2 
8 
In all of the four cows which recovered naturally the parasites 
reappeared in very small numbers (only found at the edge or end of 
stained blood-films) on one or several days as will be seen by reference 
to the protocols. 
(22. v. 09.) l 
Record, of Cow X. 
Temp.°F. 
morning & Cow in poor condition. 
Day evening 
Inoculated with 30 c.c. of defibrinated blood from Heifer 108. 
2 
103-0 
101-8 
3 
102-0 
104-0 
4 
101-6 
101-2 
Blood 
5 
101-0 
101-8 
Ditto. 
6 
102-4 
102-4 
Ditto. 
7 
102-4 
104-4 
Ditto. 
8 
102-2 
104-2 
Ditto. 
9 
101-0 
104-0 
Ditto. 
10 
103-2 
105-2 
Ditto. 
11 
103- 8 
104- 0 
Ditto. 
12 
102-8 
103-8 
Ditto. 
Blood examined twice daily but no parasites found. 
Parasitology ii 
16 
