244 
OBSERVATIONS ON THE BLOOD IN EAST COAST 
FEVER OF CATTLE. 
By C. STRICKLAND, M.A., B.C. (Cantab.), 
Late Assistant to the Quick Professor, Cambridge. 
Travelling Medical Entomologist, Fed. Malay States. 
The following records relate to a few observations made by me 
upon animals which Professor Nuttall experimented upon in 1911, at 
Cambridge. 
1. Enumeration of Red Blood Corpuscles. 
The red blood corpuscles were counted by means of Thoma-Zeiss’s 
haematocytometer; the blood being collected from the animals as it 
ran freely from an ear vein. Usually 300 squares of the field were 
counted; on two or three occasions only were 200 squares counted. 
Our general impression is that the third drop from the pipette which is 
spread on the counting slide gives a higher reading than the two previous 
ones. 
A series of counts were made with the blood of four cows. The 
first count was made before the animal was infected, the last a day or 
two before death; an intermediate count was made in the case of 
Cow IV. 
Cow 1 
October 15 
K.B.C. per c.mm. 
6,696,000 
November 4 
5,528,000 
Cow II 
November 28 
7,133,000 
December 15 
6,960,000 
Cow III 
February 1 
6,160,000 
February 14 
5,927,000 
Cow IV 
February 24 
4,340,000 
March 2 
4,160,000 
„ 10 
4,000,000 
