Literary Notices. Ixiii 



traces of degeneration always appear in the fibres at the base of the 

 dorsal cornua. 



3. In more distant regions cephalad the degeneration is limited 

 apparently to the column of Goll, though the possibility of its affecting 

 the innermost fibres of the column of Burdach is not excluded. In 

 the lateral columns it is limited to the dorsal part. 



4. Comparing these degenerations with those which appear in 

 points caudad of the injured area, the differences are notable. If the 

 alterations are bilateral, there is much difference between the two 

 sides. The degenerations are distributed very differently from those 

 described by other observers and from those just described. Adjacent 

 to the injured area they are limited to the most external part of the col- 

 umn of Burdach, with an enormous difference between the two sides. 

 Much less extensive is the degeneration of the lateral columns, 

 also with conspicuous difference between the two sides. The 

 degeneration of the most internal part of the ventral columns is 

 very noticeable with httle or no difference between the two sides ; there 

 is, moreover, a certain amount of degeneration in the ventral commis- 

 sure. In more distant regions caudad the degenerate fibres diminish 

 conspicuously and apparently none are present in the dorsal columns. 



5. In the case of the second dog, from which the sensory roots 

 were cut in the four last dorsal segments, the results were essentially 

 the same, with, however, the difference that in the descending degen- 

 eration the cells of the grey matter are affected in a significant man- 

 ner. They are atrophied, granulose and with a remnant of the neuro- 

 logical reticulum on the surface. 



The paper concludes with a discussion of the physiological and 

 trophic significance of the facts presented. 



c. J. H. 



Post-Darwinian Questions.^ 



" Some time before his death Mr. Romanes decided to publish 

 those sections of his work which deal with Heredity and Utility, as a 

 separate volume, leaving Isolation and Physiological Selection for a 

 third and concluding part of Darwin, and after Darwin J' 



The preceding paragraph from Professor Morgan's introductory 

 note sufficiently explains the scope of the present volume. We are 



* Romanes, George John. Darwin and after Darwin : an Exposition of 

 the Darwinian Theory and a Discussion of Post-Darwinian Questions. II. 

 Post-Darwinian Questions, Heredity and Utility. Chicago: The Open Court 

 Publishing Company, 1895. 



