PROCEEDINGS 



OF THE 



Camfrrifygpe IJjjHos optical Sntktg, 



Monday, January 25, 1897. 

 Mr F. Darwin, President, in the Chair. 



The following Communications were made : 



(1) Some results obtained by staining the Brain with, the 

 Chrome-silver method (illustrated by photo-micrographs). By 

 Dr A. Hill. 



Dr Hill showed a granule of the olfactory bulb with a looped 

 axis-cylinder, and also certain forms of granule of the cerebellum 

 not hitherto described. He also exhibited sections and photo- 

 graphs showing the variations in the form of the " thorns " on the 

 dendrites of nerve-cells which can be produced by varying the 

 hardening process. (1) The thorns may be absent. (2) They 

 may be long or short. (3) They may have the typical form of a 

 minute rod with a dot at the end, or the dots may be divided and 

 lie on the course of the rod. (4) They may be replaced by long 

 filaments. 



Dr Hill submitted the theory that the conducting filaments of 

 nerve-cells are continued from one neuron to another. He regards 

 the " thorns " as the cell-ends of the non-staining nerve-fibrils 

 which are invested with a film of cell-plasm. He supposes that 

 the extension of the cell-plasm along the course of the fibril is 



VOL. IX. pt. v. 19 • 



