xii Journal'"of Comparative Neurology. 



logical change in one set than the other (always excluding cases of 

 general paralysis where the changes are always conspicuous). In- 

 creased pigmentation with age was apparently allowed for and the 

 pseudo-vacuolation often mistaken for a pathological state is noted. 

 Changes in the connective elements and blood-vessels are less frequent. 

 The author concludes that the lesions of most insanities differ in de- 

 gree more than in kind from the degenerations of growth. 



c. L. H. 



DiYision of Nerve Cells. 



Rohde describes ^ the processes of division of functional nerve 

 cells in the gasteropods. Leaving out of account his theories of the 

 participation of the neuroglia in the formation of the cell bodies, his 

 three types of division are as follows : (i) one or more nucleoli wander 

 out of the nucleus and, carrying a part of the cytoplasm with them, are 

 extruded to form new cells, the parent cell remaining unaltered ; (2) 

 daughter nuclei are formed by budding everywhere throughout the 

 parent cell which finally fragments and is consumed by the process ; 

 (3) the nucleus breaks up by direct nuclear fragmentation, not by 

 budding, into a large number of smaller nuclei each like the parent. 

 Though the author's statement, " In the literature there is no account 

 of a multiplication of ganglion cells " is not strictly true ; yet it is 

 true that the few cases known, including that of Ayers published 

 since this article, present nothing comparable to the processes here 

 described. It has its parallel only in the endogenous nuclear division 

 of certain of the Protozoa. 



c. J. H. 



Monatsschrifl fuer Psychiatrie und Neurologie. 



Professors Wernicke and Ziehen in projecting this new monthly, 

 which begins with the year, have in the numbers already out fully an- 

 swered any question which may have arisen as to the need of a new 

 periodical. The original articles are not only of solid worth but rep- 

 resent the leading institutions of Europe from London to Rome. In 

 the brief " Tagesfragen " which introduces the first number some of 

 the signs of the times are briefly sketched. Notable among these is 

 the tendency to systematize, to schematize, our knowledge. This is 

 indeed a factor of our present and future progress of no mean impor- 



' Emil Rohde. Ganglienzellkern und Neuroglia. Ein Kapitel tiber Ver- 

 mehrung und Wachsthum von Ganglienzellen. Arch. /, mik. Anat., XLVII, 

 I, 1896. 



