' 



* 



convert the tubules int.. pl.-iccnUl sinuses, and tli.' villi of the chorion into vaa- 

 culiir loops, Demanded and embraced liy the lining membrane of the HiiiUKOM, 

 like the finders of a glove i I'i^. 16), aa before remarked; hut since the osipil- 



l.irv lm>ps ore projected ill the villi, the natural inferenee is that the Walls of tllO 



latUT coalesce with tin' walls of the sinuses to form this intervening mem- 

 brane. In this manner the embryonic and maternal structures are inseparably 

 Mended. 



! 1 . I-,. <KI M FROM TIIK MOLE. A, nucleus; 6. cell body; c, thickened corpuscle traversed by 

 pores. (After Leydig.) 



FIG. ir. TIIK UIMVX K.Ki FROM THE OVARY OK TIIK FKMAI.E: MUCH ENLARGED. The entire 

 egg is a simple, globular cell. The greater part of the spherical egg-cell is formed by the 

 egg-yelk, or the granular cell-sulwtance (protoplasm), which is composed of innumerable 

 delicate yelk granules, with a little intervening substance. The germ-vesicle, answering to 

 tlif .Til kernel (nucleus) lies in the upper part of the yelk. It contains a dark nucleolns or 

 ii-spoi. Thi-^lolmlur 11111*4 of yelk is surnmn<lr<l l,y u thirk transparent egg-memlirane 

 '"' 'I'liix i- penctraU'd by the pore-canals, in the form of very 



numerous hair-like lines, which run rapidly towards the centre of the globe; through these 

 the thread-shaped, moving sperm cells pass, in the process of impregnation, into the egg-yelk. 



'Hie common relation which animal life sustains to the organic laws has 



forcible illustration in the very ova, the structure being fundamentally the same 



If. and 17). The absence of a shell wall permits expansion in the 



chorion /,-iri ;>assu with the growth of the embryo, while the womb expands in 



concert with this action in the chorion and embryo. 



