The Morpholog\- of Functional Acti^^ty in the Ganglion cells etc. 489 
Circuit. Throughout the experiments, after periods of comparative rest 
as regards spontaneous activity would come periods of struggling inde- 
pendent of the Stimulus, though with the progressive exhaustion these 
periods of spontaneous activity occurred at longer and longer intervals 
and niore and more feebly. Finally, in the animals stimulated to death, 
a complete motor paralysis 
preceded. Text Fignre 1. 
No attempt was made 
to measure the strength of 
the Stimulus. As the idea 
in mind was to use a 
strength just sufficient to 
bring about muscular 
response, it was not neces- 
sary. Weakened as the 
cuiTent was by its passage 
through the water, the 
adequate stimiüus was in 
reality a feeble one. Not 
as satisfactory results were 
obtained by attaching one 
wire to the antenna, the 
other to the flipper, thus 
putting the animal dü'ectly 
in Circuit. The weakest 
current proved too strong, 
general tetanus resitlted 
and death followed rapidly 
unless the current was 
stopped. 
Four animals were 
subjected to this, from two of which measurements were made. Portions 
of the data from these are presented in Table I and in Table III. These 
are Experiment 19, in which the animal succumbed only after two 
weeks exactly of continuous Stimulation with the exception of two 
nights when the batteries gave out, and Experiment 18, stimulated for 
thirty six homs. 
But this method is primarily and essentiaUy one of artificial Stimula- 
tion and hence there might be objection raised, though it has been de- 
monstrated on other cells by numerous investigators including the writer 
