Tlie Morphology of Fiinctional Activity in tlic (ianglion Ci'lls etc. 511 
ganglia only, Table V, Text Fig. 3), stimulatcd in thc water-whecl ; of 
scnsory cells, one series of 100 centro-pcripheral and one of 50 central 
from Experiment 13, not artificially stimulatcd (Tables YI and VII, Text 
Fig. 4). In additioii there are 33 in Table I of central motor ceUs from 
the supraoesophageal ganglia of seventeen animals and 30 in Table VIII 
from fifteen new-born. These figures, namely 392 above and 457 before 
mentioned, make up tlie total after deducting those repeated again in 
Table I (4) or already included imder the first abdominal ganglion of 
Experiment 9 (14). 
l'pxt Fig-nrc 4. 
Comparison of the stimulatcd with the normal animals. — 
The point is to be made first that increase in size of the cell, though not 
of the nucleus, goes pari passu with the dcgree of activity. Itisonthis 
basis that it is legitimate to arrange the cells in each table according 
to their progressive increase in size and to make this arrangenient the 
foundation of the curves of activity (Text Figs. 2, 3 and 4, upper, con- 
tinuous line cell body, dotted line nucleus). In addition to the facts 
already indicated in the section on the argument for the correlation of 
the size changes with functional activity, the general state of edema 
and chromatin consumption was noted in a large number of ceUs along 
with the measurements and increase of size was found to correspond 
closely with the severity of these changes. Furthermore, there is the 
analogy with the Pm'kinje cell, in which increase in size is one of the 
main features of progressive activity. 
