208 à DEVELOPMENT OF THE OVULUM 
the tercine. The embryo is now visible, lodged in a conca- 
vity at the apex of the quartine, but free from all adherence, 
and consequently very easily detached. "The nucleus is at 
this time narrowed towards the middle; a corresponding 
dilatation having taken place at its base. See pl. 55, G. 
jig. 3. 
As the quartine proceeds enlarging, it pushes backwards the 
nucleus more and more, until the basilar dilatation contains 
it entirely, with the exception of its thin parietes which re- 
main in opposition to those of the secundine; the base of the 
quartine is now narrowed into an oval-shaped cellular process, 
which extends gradually through the substance of the nucleus, 
and subsequently forms a communication with the chalaza. 
See pl. 55, G. figs. 1, 2, also pl. 55, H. figs. 2, 5. 
This communication is difficult to trace, the surrounding 
tercine being grumous. The cells contiguous to the commu- 
nicating process likewise assume a longitudinal direction. 
. This coat is entirely cellular, as well as its chalazar com- 
munication: the cells of the body being rounded, and those 
of the communicating process variously elongated; the em- 
bryo soon loses its globular form, (Pl. 55, H. fig. 3,) and as- 
sumes the appearance represented in pl. 55, G. fig. 4. 
It is not enclosed in the quartine, but is merely lodged in 
its apicular niche. 
It is perfectly homogeneous : being peur y^ small cells, 
containing grumous matter. Pj. 55, H. fig. 3., G. 4. 
The apex of the embryo, or that which esterna be- . 
comes the radicle is the first to assume a definite form, G. 4, in 
which the rounded extremity is the rudiment of the future 
radicle. The opening of the primine becomes more and more 
contracted, and finally encloses that of the secundine. 
My notes go no further. The subsequent development I 
imagine to be as follows: the cotyledons are secondarily 
developed, and pass down outside the membrane of the quar- 
tine. They are rapidly developed, nearly reaching to the 
chalaza before the plumula has assumed a definite appearance. 
PI. 55, K. figs. 1, 2. 
