xcviii Journal of Comparative Neurology. 



The extensive degeneration of the dorsal columns extends to the 

 filum terminale. The collaterals extending through the dorsal cornua 

 are uniformly degenerate. Passing cephalad of the lesion the follow- 

 ing changes are noted : 



The cerebellar bundle and Gower's column degenerate. Degen- 

 eration also occurs (diminishing as we leave the lesion) diffusely in the 

 ventro-lateral column. The dorsal column is also degenerate, the 

 column of Burdach being affected as far as to the nidulus of the fun- 

 iculus cuneatus. This seems to prove that the external portion of 

 Burdach's column contains tracts extending far down the cord thus 

 contradicting the results of other observers. The author explains the 

 discrepancy by assuming that the Weigert's method hitherto relied on 

 for the demonstration of such degeneration is unreliable or at least 

 not to be trusted in its negative results. 



Weigert's method often fails to show secondary stages of degen- 

 eration which are very conspicuous by Marchi's method. Now since 

 the different tracts do not degenerate cotemporaneously it is neces- 

 sary to apply both methods to discover all degenerated bundles. The 

 first to degenerate is Coil's column, then follows the pyramidal lat- 

 eral column while the descending degeneration of the dorsal column 

 and the ascending degeneration of Burdach's and Gower's columns 

 and the cerebellar tract are later. The paper is accompanied by one 

 plate. 



Laminated Precipitates in Tissues Treated with Silver Nitrate. 1 



Dr. Hans Rabl finds evidence that the trans-striations described 

 in nerves by Frommann and others is an artifact. He quotes exten- 

 sively from other authors and presents a plate of his own preparations 

 in substantiation of his view. He obtains a similar lamination in the 

 adventitia of the blood-vessels, in the endothelial cells of the liver, in 

 fat and cartilage. 



Recent Views on Nervous Structure. 



In the Archiv fuer Anatomie und Physiologic, 5th and 6th hefts for 

 1893, is a full translation of Ramon y Cajal's recent Spanish work. 2 

 In no pages are presented the essential results obtained by this au- 

 thor from application of the silver method to the nervous system. 



1 Ueber geschichtete Niederschlage bei Behandlung der Gewebe mit Argen- 

 tum nitricum. Sitzungsb. der kais. Akademie der Wissensckaften. IVien. CII 

 Heft. 2-7, 1893. 



2 Nuevo concepto de la Histologia de los Centros nerviosos. Barcelona, 1893. 



