228 



M. IN ABA. 



nervou« cells is seen insinuutini^' itself intcj the cortex. The other 

 smaller bundle (marked in the woodcut witli a *) is interesting. It 

 is very delicate and scarcely visible, running deeply into the cortex, 

 and iinally ending in a small cluster of cells, which are distinctly of 

 nervous nature (Pi. XXX. tig. 10 B). 



Woodcut 8. 



A cross section of a IGth day embryo, left side. Ao.= aorta, cor. = cortical substance, 

 med = medullary substance, Sy. g. = ganglion of symijathetic origin. 2xBB. 



In the 16th day embryo, the nervous elements carried in the 

 organ are consideral)le (woodcuts 8 and 9). They form now a 

 reticulated network imbedded between the cortical cells, appearing in 

 sections as small scattered groups of cells. Though the main mass of 

 the nerve cells is clustered in the centre, some cell groups (PI. XXXI. 

 tig. 11) are fjund in the peripliery of the organ at its medial side 

 and send out their tibres, which actually piercing tlirough the con- 

 nective capsule become continuous with the ganglion near the organ. 

 In others (tig. 12), altlnjugh the tibres pierce through the capsule. 



