456 DAVID H. DOLLEY 



obtained figures representing volume are larger than the figures 

 from wax reconstruction representing weight, the volume of one 

 wax cell (Number 9) was calculated by weighing the water dis- 

 placement. While rather crudely done, the volume of the plasma 

 came within two cubic centimeters of the volume figure in table 

 3, and the volume of the nucleus corresponded more closely 

 (92.7 to 7.7). It seemed sufficient. 



THE NUMERICAL STATEMENT FOR THE DOG OF THE SPECIES CON- 

 STANCY OF THE NUCLEUS-PLASMA COEFFICIENT OF THE 

 FUNCTIONALLY RESTING PURKINJE CELL 



This statement is very simple. The nucleus-plasma coeffi- 

 cient is the figure obtained by dividing the nuclear mass into 

 the plasmic mass, the plasmic mass being the total cell volume 

 less the nuclear volume. In the case of the wax reconstruction 

 the plasma and nucleus are of course separately constructed. 

 The figures for the coefficients are placed in the last columns of 

 tables 1, 2 and 3. 



First, after the method of average measurements, the great 

 majority of the figures for the resting Purkinje cell are in the 

 close neighborhood of eleven (table 1). The only noteworthy 

 exceptions are three, all on the maximum side and barely over 

 twelve. These exceptions are regarded as well within the limits 

 of permissible technical variation, for definite reasons to be 

 given under that section, and are so explained, even without 

 calling upon a biological factor of variation which is possible 

 in one of them (Senility, Experiment Cerebellar Section 4). 

 As a matter of fact, the greatest exception, Experiment Shock 37, 

 was for that reason one chosen for the wax reconstruction. By 

 this method, away from the limitations of average measurements, 

 it is brought into line of constancy. 



Second, after wax reconstruction, the figures from the more 

 impersonal and mechanical and hence more reliable one micron 

 serials are within the range of the most uniform of the preceding 

 results (table 2). The arithmetic mean of the coefficients of 

 the five cells is 11.129, the standard deviation is ± .2037, and 

 the coefficient of variation is .01830. 



