Ixvi JouR^'AL OF Comparative Neurology. 



The mid-brain is composed of two neuromeres, from which the third and 

 fourth nerves originate. The hind-brain consists of six neuromeres. Ex- 

 cept as regards the origin of the sixth nerve and corresponding neuro- 

 mere, Waters thinks that the views of McClure and Miss Piatt are cor- 

 rect. When the abducens neuromere exists, the sixth nerve occupies the 

 theoretical position ; but when fusion has taken place between the trige- 

 minus and abducens neuromere, the sixth nerve is shifted caudad towards 

 the .seventh and eighth nerves. 



In all probability, the central nervous system of the primitive verte- 

 brate consisted of a series of symmetrical intersomitic segments. The 

 segments of the head and trunk regions were perfectly homologous in 

 origin, character, and function. Therefore the complex encephalon has 

 been evolved by a direct differentiation and specialization of the ten or 

 eleven segments of the primitive neuron (neuraxis). The great differen- 

 tiation and rapid ontogenetic increase of the anterior brain region seem 

 to account for the relatively greater size and the early degeneration of 

 the segments of the fore-brain and mid-brain, and for the persistence of 

 the segments of the more primitive hind-brain. — [C. H. T.] 



The Annual of the Universal Medic.'vl Sciences. i 



This yearly report of the progress of the general sanitary sciences 

 throughout the world forms five substantially and even elegantly gotten 

 up volumes illustrated with chromo-lithographs and numerous cuts. 



Volume II contains Diseases of the brain, by L.-^NDON C. Gray, M. 

 I), and Dks. Pritchard and ScHtiLTZ; Diseases of the spinal cord, by 

 \W . R. BiROSALL, M. D.; Peripheral nervous diseases, by P. C. KnaI'P, 

 M. D.; Mental diseases, by C. H. RoHE, M. D., and other matter of in- 

 interest to the neurologist. 



In volume III is a valuable discussion of Surgery of the brain and 

 nerves, by J. \W. Packard, M. I). 



The departments of Opthalmology and Otology, the first by Dr. 

 Oliver, and the second by Drs. Turnbui.l and Bliss, will be found in 

 volume IV, as also the section on Histology, which is relatively neg- 

 lected. 



The section on Physiology is by Professor W. H. IldWELi., and it is 

 needless to say is excellently done. Indices and other addenda add to 



1. Edited by Charles E. Sajoi's, M. I), and seventy a-ssoeiate editor.". F. A. 

 I>avj:, I 'hi la. 



