PISTILLUM. 101 
other Botanists at that time, that placente must necessarily 
alternate with the stigmata." 
he explanation of an Orchideous stigma is very complex, 
see Iridez for a two-lobed style, and I may observe that the 
lobed condition of the web connecting the fertile arms is 
not a proof of its being of a double nature in the sense 
Dr. L. means, this will be quite evident from the structure 
of Meyenia. ; 
April, 19th, 1841. In Plumeria I find the same essential 
occurrences in the evolution. The same fashioning out 
of the sepals, petals and stamina from a shining capitate 
termination of the axes of the branches of the inflorescence. 
The same posterior appearance of the Pistillum in the 
centre of the depressed disk, in the shape of an elevated 
rim sloping in the direction of the line of subsequent union 
of the two. 
At one period the young pe petals and stamina repre- 
sent a button with a flattish disk, and a raised 10 lobed 
border: the alternate lobes representing the stamina being 
smaller and rather interiorly situated. The spaces between 
the petals are. a good deal larger than in Calotropis, and 
hence the less interior situation of the stamina 
I also find that even in the very young MSN, the divisions 
between the petals do not reach to the place of the base 
of the sepals, but this I am rather disposed to attribute to 
a slight elongation of the axis between the two whorls, than 
to the union of the petals among each other. 
The Pistillum in its young stages obviously represents 
a leaf folded inwards with thick margins; and from these 
margins when still more inflected do the placentz arise. 
With regard to the pollen, the steps are also almost 
precisely similar, there is the same original continuity, 
the same appearance-of grumous matter in the situation of 
the cells, the same occupation of the cells subsequently by 
a consistent homogeneous grumous mass, then by a grumous 
mass cellularly subdivided, then by a more cellular mass 
containing nuclei, the same subdivision of these, (two being 
also a common number, when three, either all equal, or one 
