SPECIES IDENTITY OF NUCLEUS-PLASMA NORM 469 



37 had cells of this type. The length of the long diameter thus 

 exaggerated would explain the exceptional figure in table 1, and 

 the wax reconstruction makes it certainly accidental. As a 

 matter of fact, the individual computations in this series are the 

 most uniform of all, as table 4 shows. 



For the most part the cells selected belonged to the usual pear- 

 shaped form. However, the more uncommon forms were not 

 refused in all the series. . The inclusion of cells with two den- 

 drites or of cells broader than long, at least, does not affect greatly 

 the resultant ratio when they are measured according to fixed 

 rules, that is, their nuclei correspond. On the other hand, that 

 it is not merely a matter of averages is indicated by the fact that 

 when certain types of activity, as mentioned under "Definition 

 of the resting cell," were confused with the resting cell and in- 

 cluded, an inharmonious result was obtained. This was the 

 case in Experiment Muscular Exertion 30a, for which the re- 

 corded measurements represent a corrected repetition. 



It was the custom in making the measurements to record on 

 any cell peculiarities of whatever nature that would render it 

 questionable beyond the usual limits of acceptance. If more 

 acceptable cells appeared in sufficient number in a reasonable 

 number of sections — each series represents the survey of some 

 twenty-four to forty sections — these questionable cells were 

 then possibly disregarded. As the aim was rather to give every 

 chance for variations to show up, the different series in by far 

 the most part, to be exact, in 11 out of 15 series in table 1, rep- 

 resent the first twenty-five cells met that were diagnosed of 

 the resting state and were sufficiently and properly in section. 

 The latter is the main handicap. No averages were made until 

 all cells were selected, all repetitions of measurements are noted 

 in the text, and there is only one case in which a cell was excluded 

 after the whole calculation was finished because the nucleus 

 was obviously too small to be fully in section (Experiment Shock 

 36). The coefficient was thereby changed from 12.18 to 11.88. 

 It also seems proper to say that the variations in size and shape 

 and in relative size of cell to nucleus are sufficiently great to 

 make it impossible to know how the measurements will result 



