xxxii Journal of Comparative Neurology. 



anterior parietal organ and in teleosts of the zirbelpolster and in both 

 cases is strictly membranous like the other parts of the tela choroidea. 



c. J. H. 



The Formation of the Central Canal of the Nervous System of Teleosts. ' 



Evidence is submitted to show that the central nervous system 

 in teleosts, unlike that of that of the other vertebrates, originates as 

 a solid cord instead of a tube. There is then a rapid multiplication 

 of cells vi'ith karyokinesis in the middle of the cord, as a result of 

 which large intercellular spaces are formed which ultimately fuse to 

 form the central canal. 



Changes in Nerve Cells During Functional Activity.^ 



An investigation along lines suggested by Hodge and Vas upon 

 the superior cervical sympathetic ganglia of the rabbit, motor areas 

 of the cerebrum of the dog, the lumbar region of the spinal cord of 

 the dog, also the retina and visual centres of the dog. The conclu- 

 sions are : 



1. That during rest several chromatic materials are stored up in 

 the nerve cell and that these materials are used used up by it during 

 the performance of its function. 



2. That activity is accompanied by an increase in size of the cells, 

 the neuclei and the nucleoli of the sympathetic, ordinary motor and 

 sensory ganglion cells. 



3. That/atigue of the nerve cell is accompanied by shrivelling 

 of the nucleus and probably also of the cell and by the formation of 

 a diffuse chromatic material in the nucleus. 



Details of the technique are given in the paper. 



The Pathology of Insanity.' 



This comprehensive paper is one of the best illustrations of the 

 application of the method of comparative anatomy to pathology which 

 has thus far appeared. An exhaustive resume of the newest and best 



1 RoUDNEW, W. Note sur la formation du canal dans le syst^me nerveux 

 central des teleosteens. BM. Anai., Ill, i, Feb. 1895. 



*Mann, Gustav. Histological Changes induced in Sympathetic, Motor 

 and Sensory Nerve Cells by Functional Activity. Preliminary Note. I pi. 

 /our. Anat. and Phys., XXIX, N.S. IX, i, Oct. 1S94. 



'Andriezen, W. Lloyd. On Some of the newer Aspects of the Pathology 

 of Insanity. Brain, LXVIII, Winter, 1894, pp. 548-693. 



