224 



M. TNABA. 



the spinal nerve enters each ganglion. The ganglia send out branches 

 downwards between the aorta and the cardinal vein, but they are 

 ver^' tine, often consisting of a single row of cells and cannot be 

 clearly traced. Yet on the medial side of the suprarenal blnsteinn, 

 closely applied to it, there is seen a small irregular grou]) of deeply 

 stained cells (fig. 8, sy'. g'.), whose nuclei are a little smaller and 

 more granular than those of the suprarenal, and similar to the cells 

 of the sympathetic ganglia. Probably these cells are of the nervous 

 nature. 



Woodcut 4. 



Migli <- — 



A cross section taken near the posterior end of the suprarenal 1)odi»js.— Later stage 

 of the 13th day. Ao.— aorta, Bv.=veins, G. O.^geuerative organ, s. r.=suprarenal 

 blastema, s. t.=segmental tubiilus, sy. g. = symi)athetie ganglia, v. o.-- vena cava, v. 

 car.— cardinal veins, "W. D.=WolfRan dnct. 2xaa. 



Towards the close of the 13th day (woodout 4), the cardinal 

 veins greatly retrograde, on the right side almost completely. Thus 

 the central vein of the right suprarenal becomes now the direct 

 continuation of the vena cava, and the left central vein becomes a 

 side branch from the great vein. The suprarenal blastemas of the 

 tw^o sides are now placed not ventrally, but laterally to the aorta. 

 The mesonephros is pushed laterally and Miiller's duct is distinct. In 



