a 
. . renders such objects more transparent.] 
IN CALOTROPIS PROCERA. 49 
fectly formed, but their crura do not cohere with the pollinia. 
' The ovules have not undergone curvation, they have a short 
i stalk, but a furrow or groove is detectable along the upper 
e. 
When the corolla is three lines long, the corona is nearly 
perfect, its upper edges tinged with pink, and reaching a 
little above the base of the anther. All the parts have 
received their development, but no union has taken place be- 
tween the pollinia and glands. Vide Pl. 25. (—F.) 1. 2. 3. etc. 
The pollinia consist of a yellow closed sac with an uniform 
structure and consistence; it contains a mass of simple 
cells, containing a nucleus of granules, and 1 to 5 transpa- 
rent bubbles (of oil?) this mass is only slightly coherent: 
its component cells which are the pollen grains are easily 
separable, no traces of cellularity visible in the membrane 
of the sac when it is freed from the grains. 
When the inversion of the ovula is nearly 1 complete, the 
groove is very distinct. 
No other change of any importance takes place, besides 
the union of the glands and the pollinia ; the neck of these 
first appear through the apex of the cell, and then the union 
takes place: the crura of the glands are highly elastic at this 
time. "Vide Pl. 25.(—F.) 5. 5a, 55. 
The union soon becomes most firm, so much so.that the 
pollen grain rather tears across than gives way from the gland. 
The perfect flower presents precisely the same structures, 
only enlarged. The processes of the corona are now secret- 
ing the inner surface, especially towards the fundus ; they 
are separate throughout their length, except at the apex of 
the ineurved spur. 
The perfect pollen mass is a yellow quite transparent wavy 
object, with an entire membranous edge, and an apparently 
cellularly sub-divided superficies. [This transparency or in- 
visibility of the amylaceous or proper granules, appears to 
me curious, and is worthy of more close examination; gene- 
rally water has no such particular action, indeed its action 
may be stated to be in some measure the reverse, since it 
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