26o FISH. [Vou X. 



branches into the lateral columns. Concerning the dendritic 

 processes of the nerve cells, he concludes that they, after 

 numerous divisions, pass into the nerve-conducting paths as 

 the axis-cylinders themselves. 



Golgi (15) criticises the article severely, especially Lav- 

 dowsky's inability to find a distinct axis-cylinder process. 



The investigation of Sclavunos (51) was likewise confined to 

 the myel and was based upon the larvae of Salamandra niacu- 

 lata and Siredon. Especial attention was given to the dorsal 

 roots. He was unable to find fibers passing through the gan- 

 glion and continuing undivided in the myel as has been 

 described by Lenhoss6k and Cajal, but rather that all the 

 fibers divided into a cephalic and caudal branch, nor was he 

 able to find collaterals given off from the fiber before its 

 division into these branches, although they were found constant 

 enough on the branches, ending in three or more branchlets 

 which terminated freely between the round cells forming the 

 cinerea. In the spinal ganglia he has noted cells with two 

 processes (bipolar), the peripheral process being thicker than 

 the central. The neuroglia is composed of cells extending 

 from the myelocoele to the periphery. Those immediately 

 bounding the cavity were of brownish color while ectal to these 

 were some more darkly colored and possessing two processes ; 

 the central process extends undivided to the cavity, while the 

 peripheral one divides two or more times before it leaves the 

 cinerea. Cells were also found without the central process. 

 The glia fibers were followed to the periphery and were seen 

 to end for the most part just ental to the pia with a greater or 

 less enlargement, and were in no way connected with the pia. 

 Spider cells as seen in the adult myel were not observed by 

 Sclavunos in the larva. 



As far as ordinary histological methods reveal its structure, 

 the neuraxis of the DestnognatJms might be very briefly char- 

 acterized as consisting of an ental and an ectal layer : the 

 ental or cellular layer of cinerea is composed of conical cells 

 and varies in thickness in different regions, becoming quite 

 attenuated at the roof of certain parts of the cavity. In the 

 myel, the layer averages from six to eight cells deep, while in 



