518 
Da\n(i H. Dolley 
first abdominal gaiiglion series, tlie centro-peripheral motor cells in Tables II 
and III may be taken, representing respectively Experiment 10, an un- 
stünulated anmial, and Experiment 19, stimulated by electricity. The 
weight of the animal was not taken in Experiment 10 (kiUed on the bank 
of the streani) but its size was noted according to a compai'ative scale 
and it is true it was smaUer than Experiment 19, not, however, over 
oue thü'd. If it were even smaller, it would not explain away the dis- 
proportion between the two largest cells in both series, those of Experi- 
ment 19 being triple the size of Experiment 10. And at the beginning, 
opposed to the foiir ceUs ^vith low nucleus-plasma coefficients in Experi- 
ment 10 there is only one and it somewhat doubtful, in Experiment 19. 
Again, with the exception of the first cell, all the cells of Experiment 19 
are highly advanced as compared with the normal. Just as characteristic 
are the not only higher but more irregulär coefficients at the end. Se- 
veral cells are approaching exhaustion. Comparing lastly aU the un- 
published series from the first abdominal ganglion of Experiment 19 
with those of Experhnent 9, animals of the same size, the largest cells 
and the smallest cells average nearly twice as large in the former. So 
far as the detailed study by measurernents is concerned, all the stimulated 
animals are definitely the more advanced. Yet, considering the severity 
and long continuance of the experhnental process, the cells, considered 
collectively, are far from exhaustion. The only conclusion is that the 
cells are slow of reaction and strong of endurance. The exhaustion of 
individual cells woidd seem to be likely a matter of localization. 
The Statement of the normal nucleus-plasma relation. — ■ 
The groups of smallest cells in each of the series presented may be seen to 
have a nucleus-plasma coefficient that averages, whatever the size of the 
cell, a practicaUy constant nurhber, namely about eleven. And the 
figures for the individual cells ränge for the most part between ten and 
twelve and in fact show less Variation than is to be found anywhere eise 
in the series. This fact is the more remarkable when the variations in 
the sizes not only of the different types in the same animal but of the 
same type in different animals are considered. Further, in the several 
series from the first adominal ganghon, the same figirres resulted in every 
series beginning with an e\ndent resting or closely related type. Specifi- 
cally, this was the case in the three normal animals in nine out of the 
possible twelve series from all four types. In other words, in every animal 
the cell body of the resting cell of the four main types of neurons is the 
same number of times larger than its nucleus, whatever the size of the 
cell. In 1903 Richard Hertwig stated his nucleus-plasma relation 
