CHROMATOLYTIC CHANGES DURIXG HIBERNATION 397 



We wish to thank Prof. Sutherland Simpson for his helpful 

 guidance in this research. We are also indebted to Prof. B. F. 

 Kingsbury for assistance in taking the photoniicrographs.' 



LITERATURE CITED 



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 Cajal, Ram6x y 1904 Variaciones morphologicas, normales et pathologicas 



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Univ. de Madrid, vol. 3, p. 9. Conipt. Rend. Soc. Biol., vol. 56, p. 372. 

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natur. de Bruxelles, vol. 1.). 

 Legge, F. 1899 Sulle variazioni della fina .struttura ehe presantano iluranto 



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p. 152. 

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temperature. Revue Neurolog., No. 14 (July 30, 1905), p. 7S4. Re- 



cherches sur les changements de structure que les variations de teni- 



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1906 Recherches sur le.-^ changements dcs ncurofibrilles consecutifs 



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-In regard to tlie general problem of the correlation of structural changes to 

 activity in nerve cells, attention should be called to the experiments carried 

 out on six different species of animals by R. A. Kocher, reported in this journal 

 (vol. 26, No. 3, p 341) since this article was submitted for publication. This 

 author could find no correspondence between the size or structural character- 

 istics of nerve cells ami various grades of activity. 



