Genetic Relation of Neurofibrillae to Chromatin. 85 



Explanation of the Plates. 



Merely for the sake of simplicity in demonstrating the accuracy of 

 the above described observations all figures have been selected from a 

 single preparation of longitudinal sections of the central nervous system 

 of an adult salamander, Salamandra maculosa. This preparation is at the 

 disposal of anyone interested, but owing to its being preserved in cedaroil 

 without coverglass — in order to make possible the application of a ^/^g 

 imm. obj. on sections of 80 /t — transportation is very risky. 



The staining and impregnating methods used are considerable in 

 number. A maximum color contrast applicable to the most delicate 

 structures is to be found in one of my own methods, the details of which 

 will be published as soon as further modifications guarantee satisfactory 

 results with a minimum expenditure of time and energy. 



The photographs were made with the aid of homog. imm. ^/j^, oc. 1 

 and 8; drawings-camera lucida, homog. imm. ^/^g, with oc. 1, 8, 4, 12, 

 18 etc. for details. 



Plate 7. 



Fig. 1. Spinal cord. Cent, grey matter. "Kesting" nucleus of a 

 tripolar gangl. cell. 2800 : 1. 



Fig. 2, Nucleus from grey matter sp. cord. Early stage of fibrillar 

 differentiation and nuclear budding. 2500 : 1. 



Fig. 3. Chromofibrillar outgrowth from the nucleus of a unipolar 

 ganglion cell from the inner grey mat. sp. cord. Fibrillar structure very 

 poorly shown in photograph. 2400 : 1 . 



Fig. 4. PuEKiNJE cell from cerebellum during last emancipation of 

 chromofibrillae in the neurite. 2400 : 1. 



Fig. 5 and drawing Fig. 11. From grey matter of spinal cord. 

 Above ; outgrowth of chromofibrillar bundle. The bud continues its course 

 in the adjacent section. Fig. 5 1800:1; Fig. 11 3650: 1. 



