402 



GAULE. [Vol. VIII. 



with the microscope. I used a power (Zeiss oc. 4, obj. D.) 

 hio-h enough to enable me to see the cells easily and yet over- 

 look as much of the spleen at a time as possible. After 

 counting those in the circumference, I counted those in two 

 diameters at right angles to one another, taking care not to 

 recount those already enumerated. When the number for a 

 section was determined I classified them under four heads — 

 0-5, 5-10, 10-15, 15-20, in order to simplify the curves; 

 = 0, 5 — 10 eosinophilous cells, 10 = 50 cells, 15 == 100 cells. 

 Every number beyond 15 represented 100 cells. , 



d. Follicle-Cell Curves. 



In estimating the amount of follicle cells I was obliged 

 to rely upon the oft-repeated comparison of the spleens. An 

 opinion was then formed for each spleen in turn, and the result 

 noted in the form of a number, 5 representing a small propor- 

 tion of follicle cells, 10 many, and 15 very many. 



e. " Ntirse^'- Cell Curves. 



The proportion of these cells was determined in the same 

 way as the foregoing ones, it being impossible to count them 

 on account of their indefinite form and variable character. 



f. Cytozoa Ciirves. g. Pigment Curves, 

 f and g were determined in the same manner as ^ and d. 



h. Curves of the Figures of Ccll-Divisiou. 



They were counted simultaneously with the eosinophilous 

 cells. The resulting numbers 5 = 5 figures, 10=10, 15 = 20 

 figures. 



i. Plas7noso77ia Curves. 

 Their proportion was determined like the curves tr, d, e,f. 



