56 
Trypanosomiasis of Camels 
The second considerable rise of the curve of the polynuclears occurred on 
the 73-75th days (52-62 %), shortly before death. This period may be 
called the period of secondary polynucleosis. 
During the remaining period the curve was below the average. 
The large mononuclears do not appear to take any conspicuous part in 
the changes of the blood, but in general their percentage rises (to 6 %). 
A more important role belongs to the transitional forms. From the mean 
of 4-2 % they rise in general, and sometimes even attain a high number 
(25-6 % on the 13th day), these rises of the curve corresponding to the presence 
of trypanosomes in the blood. 
The comparatively high percentage of the eosinophils (6-5 %) before 
infection must have been due to the presence of a large number of ascarids 
in the intestine. Later this percentage rose only on the first two days pre¬ 
ceding infection, whilst later it fell, even disappearing from the blood. 
The mast cells which were present in insignificant numbers (0-6 %) before 
the infection, were always encountered in the blood beginning from the 15th 
day and their numbers even reached 6 %. 
The percentage of TiircFs Reizungsformen, prior to infection—3*6 %, not 
only did not rise, but even fell to 0-3 %. 
The myelocytes, previously to infection 0*8 %, disappeared at the beginning 
of infection; but from the second third of the disease they reappeared (reaching 
2*6 %) and remained till the 61st day, when they disappeared for 12 days; 
but from the 73rd day they reappeared and were present in the blood until 
the death of the animal. No correlation between the number of these elements 
and the presence of trypanosomes was observed. 
In Yakimoff’s work on the change of the blood in dogs infected by 
Trypanosoma hrucei and equinum we see that during infection the curve of 
the total number of white blood corpuscles is directly related to the curve of 
the polynuclears, and inversely, to the curve of the lymphocytes, but there 
is not such a strict parallelism in this case. 
Thus, the general picture of the distribution of the different forms of 
leucocytes during infection is as follows: 
First period. Primary nucleosis with a diminution of the percentage of 
lymphocytes. 
Second period, the longest, is characterized by mononucleosis (chiefly by 
lymphocytosis) with an increase in the mast cells and a decrease in poly¬ 
nuclears, both neutrophil and eosinophil. 
Third period. Secondar}^ polynucleosis (greater than the primary) with a 
corresponding diminution in the percentage of lymphocytes. 
(5) The Arneth Index. Some interesting data were also obtained by the 
Arneth index. 
The average number of the different forms of polynuclears prior to 
infection was as follows: 
