114 DEVELOPMENT OF THE FLOWER 
the form of loose grains, although the outline of the parent 
cell is difficult of being distinguished, except towards the 
circumference and point? The nucelles have escaped from 
the parent cells, and have apum a spherical form; they 
are the pollen grains. 
Thé escaped nucelli are still grumous, but less so than 
when in the parent cells, this may arise from their greater 
size. The grains immediately begin developing sulci. 
l. Lateral view of stamen. 
2. Portion of mass. 
3. 4. Nucelles and parent cell. 
5. Nucelles just separating. 
6. Ditto separated. 
7. Two young pollen grains. 
Series G.—Pollen grains, developing sulci, the first ap- 
pearances are four or more thickenings of the membrane. 
Series H.— Process nearly two-thirds up the anther. The 
mass in the circumference is still grumous and still presents 
some cohesion. The central consists of free pollen grains, 
which are larger than those imbedded in the grumous cir- 
cumferential tissue. The young grains are now transparent 
membraneous, they presenta variable but yet probably a de- 
` finite number of thickened sulci, which in some points of view, - 
look as if they radiated from both ends, until they nearly 
meet in the centre. All stages of formation may be seen, from 
the young wv grain, to one — 8 and 10 sulci. 
l. Stam 
2. Mi pressions loose -grains in die centre. 
^ - Presenting of the margin of the mass signified. 
3 Grains at dieron degrees of development. 
6 
Series I.— Pollen grains, with the complete number of pores 
and folds? 
Series J. —Pollen grains developing their suia amy- 
‘laceous granules; these are developed from the, interior of 
the grain, and are acted upon by Iodine. None are formed 
before the folds and pores appear complete. : 
* 
