188 DEVELOPMENT OF THE OVULUM 
Embryonary sac pendulous: traces of its attachment visible 
up to a very late period, perhaps always at its apparent 
apex, but real base; distinetly cellular, separates in the ripe - 
seed from the testa which adheres to the pericarpium, so 
that four layers are demonstrated surrounding the embryo; 
calycine pericarpal testa, and embryonary sac. Raphe sub- 
 sequently nearly complete, perhaps quite so, but owing to 
adhesion, this is difficult to determine ; embryo soon loses its 
attachment ; radicle, as usual, developed first. 
Cotyledons parallel with the raphe. 
ee 11th June, 1836. 
€ 
PIPERIS sp.—PraTE xrvi.—Fic. 2. 
The ovarium is simple only by abortion, since there is 
always more than one stigma, generally four. 
The ovulum is erect; the foramen at its apex, and cor- 
responding exactly to the termination of the stigmatic canal, 
which indeed it closes inferiorly. It has two coats, the outer 
one being very laxly cellular, and thick ; the nucleus is broad- 
ly ovate, almost cordate: with a brown spot towards the 
centre, in which the tissue is commencing to be dislocated 
and absorbed. 
After fecundation, the outer tegument becomes very thin, 
the second is still of considerable thickness; the nucleus 
corresponds exactly to the cavity of this, is large and 
fleshy ; its apex is hollow and covered only by the proper 
membrane of the nucleus. From its extreme apex the em- 
bryonary sac, which is very minute, is seen hanging, at- 
tached by a broad and short cell, it is itself à membranous 
sac, perfectly globular, and as it were, turged with grumous 
matter. - 
a. Long section after fecundation. 
b. Long section of nucleus. 
c. Ditto of ovulum. 
d. Ditto of ovarium. 

