572 PHOTOTROPIC RESPONSE OF NECTURUS 



sity of 4,200 candle meters. The averages obtained were almost 

 identical with those from normal animals. It is therefore concluded 

 that the skin is the important receptor for the photic stimulus. 



BIBLIOGRAPHY. 



Eycleshymer, A. C, The habits of Necturus maculosus, Am. Nat., 1906, xl, 123; 



Reactions to light of the decapitated young Necturus, J. Comp. Neurol., 1908, 



xviii, 303; Some observations on the decapitated young Necturus, Anat. 



Anz., 1914, xlvi, 1. 

 Hecht, S., The effect of temperature on the latent period in the photic response 



of Mya arcnmia, J. Gen. Physiol., 1918-19, i, 667. 

 Pearse, A. S., Reactions of amphibians to light, Proc. Am. Acad. Arts and Sc, 



1910, xlv, 159. 

 Reese, A. M., Observations on the reactions of Cryptobranchus and Necturus to 



light and heat, Biol. Bull., 1906, xi, 93. 

 Sayle, M. H., The reactions of Necturus to stimuU received through the skin, 



J. Anim. Behav., 1916, vi, 81. 



