1920.] NATURAL SCIENCES OF PHILADELPHIA. 333 



parasites tending to persist in the liver after they have disappeared 

 from other organs. At least this is stated to be the condition found 

 post mortem. 



But the \ery low percentage of parasitized cells present in the 

 spleen, only 12.2 per cent, as against the general percentage of 43.64 

 in this cow is very clearly significant. It is usual to ascribe to the 

 spleen a hemolytic function, and we appear to have an example of 

 it here. The assumption is that the cells would themselves be 

 destroyed, and along with them their contained parasites. In the 

 case in point, however, it is necessary to assume that the parasitized 

 cells are destroyed more easily than those which are still intact, but 

 this is something which would be anticipated. The presence of the 

 piroplasm in the cell would in all probability render it more suscept- 

 ible to any destructive influence. 



In the parasitized cells, the number of parasites per cell ranges 

 from one to six, the following table showing the count: 



Table 3. 



Parasites per Cell 



Cow 1031 1. 2. S. 4. 5. 6. Total. 



Heart 3537 5354 247 151 4 1 9294 



Kidney 1237 305 20 5 1567 



Liver 2372 315 10 4 2701 



Spleen 1301 85 2 10 1389 



Cow 1025 



Heart 1317 1394 29 22 2762 



Totals 9764 7458 308 183 4 1 17713 



Reducing the above to percentages, we obtain: 



Table 4. 



Cow 1031 /. 2. 3. 4- 5. 6. 



Heart 38.06 57.61 2.66 1.62 .04 .01 



Kidney 78.94 19.46 1.28 .32 



Liver 87.82 11.66 .37 .15 



Spleen 93.67 6.12 .14 .07 



Cow 1025 



Heart 47.68 50.47 1.05 .80 



Totals 55.12 42.08 1.74 1.03 02 .01 



It is perhaps desirable to mention what at first glance looks like a 

 discrepancy in the data. For example, in Table 3 there are given 

 2762 parasitized cells from the heart of Cow 1025, whereas in Table 

 1 this cow is credited with only 250 parasitized cells. This merely 

 means that in the two cases the results were based on different 

 counts. Thus, in the data given in Table 1 the cells were merely 



