Effect of Electrical Stimulation 4.75 
lated ones 64 to 13 per cent less in the amount regenerated than 
for the remaining 10 non-stimulated. 
6 With a current density greater than given above decidedly 
harmful results appear. 
7 With small current density and comparatively low voltage, 
stimulation of the tadpoles increased the rate of regeneration. 
8 With small current density and a comparatively high voltage, 
stimulation of the tadpoles for a brief period increased the rate 
of regeneration. 
g With any considerable degree of current density, or with a 
high voltage applied for more than a very short time, stimulation 
of the tadpoles decreases the rate of regeneration. 
10 With a current density of 10 0, voltage 110, stimulation of 
40 individuals showed that their average total lengths, forty days 
after the operation, were more than the average total lengths of 
the 40 non-stimulated. 
ACKNOWLEDGMENT 
This work was taken up at the suggestion of Dr. Charles 
Zeleny of Indiana University, to whom I am indebted for num- 
erous helpful criticisms and suggestions. 
BIBLIOGRAPHY 
Davenport, C. B. ’97—Experimental Morphology, part i, chap. vi. 
’°99 Experimental Morphology, part ii, chap. xvi. 
Hermann, L. ann Maruias, F. ’94—Der Galvanotropismus der Larven von 
Rana temporaria und der Fische. Arch. f. d. ges. Physiol., lvii, 
P- 394; ; 
LomparDINI, ’68—Forme organiche irregolari negli uccelli e nei Batrachidz. 
Pisa, 1868. 
Ruscont, M. ’40—Ueber Kiinstliche Befruchtungen von Fischen und Uber 
einige neue Versuche in Betreff Kiinstlicher Befruchtung an Fro- 
schen. Arch. f. Anat. Physiol. und wiss. Medicin (Miiller). 185-193. 
Verworn, M. ’99—General Physiology Translation by Frederic S. Lee, chap. v. 
Winpte, B. C. A. ’93—On Certain Early Transformations of the Embryo. Jour. 
of Anat., and Physiol. xxvii, pp. 436-453, July, 1893. 
