SPECIES IDENTITY OF NUCLEUS-PLASMA NORM 



465 



mic hypertrophy) which brings the coefficient figure from below 

 eleven to above eleven ('10). There is no chance of confusion 

 for the functioning cell is much larger and there is marked edema, 

 paleness, and loss of substance. Morphologically, until ex- 

 ception be proved, the dog's resting Purkinje cell is fully defined. 



THE TECHNICAL FACTORS IN THEIR RELATION TO THE RESULTS 



1. In the method of average of measurements 



In order to compare the difierent series, the usual statistical 

 data were computed in eight experiments, as set forth in table 4. 

 These series are well scattered and undoubtedly represent ade- 

 quately the whole. The dispersion of the coefficients of the 



TABLE 4 

 Statistical data from individual cell measurevients 



' Inserted for comparison. The statistical data are computed from the means 

 in table 1. 



individual cells is the only definite basis of comparison. In two 

 series, the coefficient was actually computed. In the others, this 

 figure was read off directlj' from the slide rule. Numerous 

 tests never gave a difference from the actual computation of 

 more than .03, so that this is sufficiently accurate. In addition, 

 the coefficients were estimated in two other series (table 4) but 

 no other data were computed. There were thus 250 cells for 

 comparison. From these the frequency-distribution was tabu- 



THE JOURNAL OF COMPARATIVE NEUROLOGY. VOL. 24. NO. 5 



