xl Journal of Comparative Neurology. 



A few nerve cells may be detected, but not enough, as the author 

 believes, to afford origin for all the axis cylinders of the tangential zone. 

 The latter is, he suggests, the locus for extensive association by con- 

 tiguity or continuity. Respecting the question as to which of these 

 methods prevails he insists upon conservatism in view of conflicting 

 testimony. 



In the second layer Dr. Lewis believes that sensory cells predom- 

 inate and that it is possible to differentiate distinct types of the sen- 

 sory cell corresponding to different cortical ^regions. He therefore 

 agrees with Golgi and the present writer rather than Cajal. 



He adds, " Our conception, therefore, of the peripheral zone 

 resolves itself into that of an enormous field of the cortex, in which 

 sensory units are brought into close contiguity with the terminal den- 

 drites of the motor pyramidal cells, and that, though sensory-motor 

 arrangements are to be found at most levels of the cortex, this field is 

 facile princeps that whereon the transference of sensory currents to 

 motor energy is realized." 



The reader is referred-to the original for details and interesting 

 illustrations. c. l. h, 



A Modified Sublimate Metliod.^ 



A method which, judging from the results obtained by Dr. Lewis, 

 surpasses in some respects all previous modifications of the Golgi pro- 

 cess is described by its author as follows: 



" When a section prepared by Golgi's rapid method is subjected 

 to the action of a drop or two of liquor potassse on a slide, the re- 

 moval of the diffuse red coloration is at once observed, whilst the 

 nerve-cells and all their processes remain deeply stained on a clear 

 background. The connective elements also participate in this color- 

 ation, and are seen to fine effect. The potash should be removed as 

 rapidly as possible, by gently inclining tthe slide and allowing a little 

 water from a pipette to flow over the section, but no longer than is 

 absolutely necessary for its complete removal. At this stage the whole 

 tissue swells out and becomes greatly expanded, as it does in the per- 

 fectly fresh state; and this expansion, as before stated, is so great that 

 we find subsequently the dendrites are split across in fine fractures at 

 more or less regular intervals along their course. This splitting of the 

 dendrons is of interest, as it appears to indicate how truly the silver- 



* W. Bevan Lewis. On a Modified Sublimate Method for the Deliniation 

 of Nervous Tissue, Edinbtirgh Med. Journal, Aug. 1897. 



