cxiv Journal of Comparative Neurology. 



brought into creosote for 15 minutes; then, after washing in turpentine, 

 they are pressed upon the slide with filter paper and covered with tur- 

 pentine balsam. The balsam is heated gently until the turpentine has 

 evaporated, a process requiring 3-5 minutes, and then covered with a hot 

 cover-glass. A number may be heated at the same time on a copper 

 plate. The sections are said to remain unaltered indefinitely.! 



The Behavior of the Nuclei of the Sheath of Schwann During 

 Degeneration of a Nerve. 2 



These interesting observations are thus summarized by Professor 

 Huber. During degeneration of medullated fibres the nuclei of Schwann's 

 sheath increase by mitotic division. The extension of the divided nuclei 

 beyond the nodes of Ranvier, is apparently accomplished by active mi- 

 gration. The assumption by Meyer and Neumann, of free nucleus- 

 formation, seems at least unnecessary. 



The hypothesis of Schifif, Engelmann and Wolberg, that there are 

 preformed nuclei in the Ranvier's segment which only become visible 

 after degeneration has ensued, is also regarded as superfluous. 



Atrophy of the Cerebellum in the Cat. 3 



This case is of sufficient interest to warrant rather extensive 'quota- 

 tion : 



"There were but two kittens born in the litter, this cat and a sister. 

 The latter is living and is bright and healthy. In disposition there was 

 a slight difference, in that the subject was more shy and timid than the 

 healthy sister, running away more quickly on the approach of strangers. 

 Sexually, he was incompetent, his efforts in this direction being blunder- 

 ing and abortive. There is no history of any injury whatever, yet the 

 trouble manifested itself suddenly, and was not progressive. Both sides 

 were affected and were so from the very first." 



" When brought to the laboratory, the cat was eleven months old. 

 Here it was observed that he was timid and shy ; well nourished ; could 

 walk and trot ; but his gait was zigzag and staggering, as his hind legs 



1. Compare Dr. Rudolf Fick. Zur Techni(iue der (iolgi'seheu Faerbung. 

 Zeitsch. f . wiss. Mik. und niik. Technique, VIII, 2. 



2. HuBEtt, G. Cael. Ueberdas Vehalten der Kerne der Schwann 'schen Scheide 

 bei Nervendegeneration. Archiv. f. mikroskop, Anatomic, XL, p. 409. 



3. Krohn, William O. .Journal of Nervous and Mental Diseases, October, 1892. 



