ANTHERS— POLLEN, 103 
The three are either equal, or else a modification of zx 
one nucleus divided into 2 nucelles. : 
e grains as nuclei in the parent cell, are just appre- 
ciately granular. On becoming free from restraint they as- 
sume a spherical form, and begin to develop pores, or in 
one and the same anther interruptions of the outer thick 
coat. The grains assume an angular form in the folds, angles 
bifid, part of the process of developing coats. 
Calotropis.— The same mode of development obtains as in 
Calotropis. When the calyx is very minute, its centre will 
be observed occupied by a shining disc, obscurely pentangular, 
the angles alternating with the sepals. The estivation is 
determined equally early. The largest sepal is in the axil 
of a bract! [Pl]. 39.—Fig. 2, a, did not occupy this line on 
the other side, b,—ż disc ; c, estivation ; d. transparent gru- 
mous near the midrid.] 
The anthers in the earliest stages are thick, oblong, cellu- 
lar bodies, occupying the sinuses of the petals, "— last 
are mere cellular scales. 
Pressure demonstrates even at this very early period, four 
lines of grumous semi-opaque matter, continuous with the 
indistinct cells of the general substance; the two outer are 
marginal, and twice as broad as the inner; the whole present 
a general tendency to confluence at the apex. Pressure 
does not cause any separation. 
In a very young stage the corolla is monopetalous, the 
divisions however reach nearly to the base. 
When they arë under a piece of glass, + represents 
them as entirely cellular, the grume is confined to a broadish 
irregularly defined line on either side of the connectivum, 
passing gradually into the general cellular undefined sub- 
stance. The connectif is traced out, and the grume curves 
out at the base of the anther. 
Pressure causes the discharge of a little fluid, in which 
under 5 there is an appearance of cellular substance, but 
indistinct, in a crowd of minute granular matter. There are 
traces imaginable also of four obscure cavities left by the 
discharge of the above matter. Pl. 39.—Fig. 3, f, g 
