the specific granules of the thrombocytes. If the 

 top lens of tlie microscope condenser is removed 

 and the light brought to a focus at the level of 

 the cells in the chamber — with the diaphragm 

 partially closed, if preferred — there is no dif- 

 ficulty in separating thrombocytes from each 

 of the leukocytes. It is reconmiended, however, 

 that differential counts not be attempted in the 

 counting chamber. It is better to make them 

 on the slide, where each cell can be checked 



for its identity under the oil immersion lens. 

 Both with the Wiseman and the Rees-Ecker 

 method, erythrocytes can be counted in the same 

 preparation or. if some drying has occurred, the 

 counting chamber can be cleaned and refilled. 

 Erythrocytes in millions per cubic millimeter 

 are estimated in the same way as for human 

 blood. The correct procedure for counting 

 erythrocytes is given in numerous books on tech- 

 nic of hematology for the human. 



i 



234 



