534 W. L. Andriezeii 



This fluid acted in every way better than xylol, or creosote, 

 being free from the setting up of violent currents which the first pro- 

 duced, or the darkening- of the groundsubstance which the latter pro- 

 duced, while the section too exhibited not the slightest tendeny to 

 brittleness, especially sections cut without imbedding in celloidin; but 

 were firm, elastic and easily manipulated. They were mounted in 

 xylol dammar without a cover-glass, and placed in the incubator at 

 a Temp, of 37 to 40 C. for 1 day or a little longer. 



Besides the silver-chromate staining which gave the finest results, 

 other stains tried were Carmine, Acid Fuchsine and Toluidine Blue. 

 The patent acid Rubin was also tried. None gave such sharp, perfect, 

 and differential staining from the ground substance as the silver Chromate. 



The classical description of the blood vessels of the cortex, includ- 

 ing the adventitia in particular can be gathered in general from the 

 works of Ebertli, Meynert and the usual works on Histology: which all 

 recognize the intima, muscularis, and adventitia here as elsewhere in 

 the body. These need no special references. 



The blood vessels of the Brain have been stated to lie in channels 

 excavated in the ground-substance, so that an actual space can be 

 demonstrated between the adventitia and the Brain substance. This 

 has been recognized by nearly all writers, including Schwalbe (Lehrb. 

 d. Neurologic. 1881), Beven Lewis (Textbook of Mental Diseases. 1889) 

 and Obersteiner (translated by Hill. 1870). More recent text-books 

 (Edinger's Zwölf Vorlesungen. 1892), and writers in neurology and 

 neuro-histology make no special mention of anything else, the classical 

 description being followed in all cases. 



With the advent of Golgi's method and its fruitful application by 

 Golgi, Cajal, Retzius and others a pathway was opened for a more pre- 

 cise investigation of the nerve as well as glia elements which the 

 earlier methods of staining, teasing, maceration etc. did not allow. 



By the application of the staining with Silver Chromate, we are 

 able to elucidate the following points in regard to the neiu'oglia eie- 



