ox SUPHAKEXAL IJüDIEö IN THE .MOUSE. 



1^27 



tolerably constant in iiuin1)er. tJcucrally into tlie left snprarena] 

 (woodcut 8), one ^'el•y .strijng Ijumlle enters at about the middle and 

 ventral portion of its inner margin. At the corresponding point of 

 the right suprarenal (woodcuts 7 and 9 A) a strong bundle (but 

 nnjre slender than that of the left side) is seen ; on the same level and 

 S(Hnewhat dorsal to the one just mentioned anotlier smaller Ijundle runs 

 in from the same ganglion. Besides these, a small bundle may S(jme- 

 times be seen entering the organ at its p(jsterior end (woodcut 9 B). 

 All these bundles are very delicate, and can be seen only for three (jr 

 four consecutive sections. 



It will be necessary here to describe the characters of the ner\ous 

 cells to distinguish them from the cortical cells. The protoplasm 

 in these cells is not so rich as in the cortical cells, and is very 

 granular ; their nuclei are comparatively small (4.5 u on an average), 

 thickly packed, and deeply stained due to the presence of many 

 granules. 



Woodcut 7. 



•5'y. 9. 



A cross section takeu from a loth daj embryo, right suprareual. S. r. = suprarenal 

 blastema, Sy. g-. = <>-aug-lion of sympathetic origin. 2 X B. 



The place marked ^ is uiDre uiagnified iu fig. 10. A. (PI. t.) The jilace marked * is 

 more magnified iu fig. 10. B. 



In tig. 10 A (which rei)resents a portion of tlie woodcut 7 

 under a higher ))ower) taken frc^m a 15th day embryo, a mass of 



