Microscopic Examination of Blood. 321 



mated as 40 per cent, of the quantity found in normal blood; 

 about one-half the quantity that should occur in the number 

 of coloured corpuscles in this blood. 



Very few poikilocytes were found. The lack of tendency 

 of the coloured corpuscles to become crenated, even when 

 such change was invited, was a peculiar phenomenon. Roul- 

 eaux were formed as in normal blood. 



The average diameter of one hundred leucocytes was sz\^ of 

 an inch, which is somewhat larger than the average of those 

 in normal blood. The largest wereriswof an inch, the small- 

 est BTjVffof an inch. 



An estimate of the number of leucocytes, made by counting 

 one hundred squares of the ha^macytometer, resulted in find- 

 ing 3^0,000 per cubic millimeter. The numer of leucocytes 

 to the number of coloured corpuscles was about as i to 13. 



The study of the nuclei of the leucocytes was not as 

 thorough as could be desired. Nuclei of the four varieties 

 were easily recognized. 



The largest leucocytes predominated. Whether or not 

 some of these were what are called myelocyles was not 

 determined. 



The amoeboid movement on the warm stage was much 

 more sluggish than that exhibited by the leucocytes of normal 

 blood. The movements were usuallv a mere change of out- 

 line, and not that lively locomotion indulged in by certain 

 leucocytes of normal blood. 



Blood plaques were especially numerous, sometimes uniting 

 to form masses of large size. Frequently leucocytes were 

 seen with blood plaques adhering to one hemisphere, under 

 medium powers giving the impression that the leucocytes 

 contained coarse granules in one portion of their substance. 



Hisiolofrical Laboratory^ 



State University of Iowa. 



March ^ i8gj. 



