Gr. H. F. Nuttall and H. B. Fantham 
127 
stained films suggests that intracorpuscular division may take place, 
consequently further observations on the living parasite will have to be 
made before reaching a final conclusion. We may note however that 
observations on Theileria are fraught with considerable difficulty owing 
to the minuteness of the parasite. 
Correction. 
In our previous paper ( Parasitology , vol. n. p. 327) we stated that 
Theiler (1901) was the first to demonstrate that ticks transmitted East 
Coast Fever, overlooking at the time the earlier work of Lounsbury to 
whom the credit is due. Lounsbury reported upon positive experiments 
more especially with Rhipicephalus appendiculatus, in his Report of the 
Government Entomologist (Cape of Good Hope) for the years 1902, 1903 
and 1904. 
It appears moreover that the first to distinguish East Coast Fever 
from Redwater was the late Dr Hutcheon ( Transvaal Agricult. Journ. 
April 1903, p. 45). A correspondent in South Africa writes of 
Dr Hutcheon: “ He was such a kindly soul that he preferred to let 
Dr Koch say definitely that they were distinct seeing that the latter 
had confused them in East Africa.” To state the matter accurately 
then, the credit of first distinguishing East Coast Fever from Redwater 
is due to Hutcheon in the first place and in the second place to Koch 
and to Theiler. 
G. H. F. N. 
EXPLANATION OF PLATE XII. 
All the figures were outlined with an AbbAZeiss camera lucida, using a 2 mm. 
apochromatic homogeneous immersion objective, and compensating ocular 18 (Zeiss). 
The magnification is approximately 3500 diameters. Blood of Cow I. 
Pigs. 1, 2. Ovoid parasites, with clear area (? vacuole) and chromatin at one end. Days 
19-22. 
Fig. 3. Small pyriform parasite, chromatin at broad end. Day 20. 
Fig. 4. Large pyriform parasite. Day 31. 
Figs. 5, 6. Comma-shaped parasites, with large chromatin mass at one end. Days 19, 24. 
Figs. 7, 8. Short, broad, rod-like forms, with large terminal masses of chromatin. Days 
24, 25. 
Fig. 9. Rounder parasite, with chromatin cap at one end, and clear area. Day 25. 
Fig. 10. Rounder parasite, with horse-shoe-shaped mass of chromatin ; slight concentra¬ 
tion of chromatin at the ends of the horse-shoe. Days 23, 25. 
Fig. 11. Large parasite with pseudopodium and chromatin at one end. Day 24. 
