THE MIcROSCcoPE. 3% 
IPOM@A QUAMOCLIT, L. (CYPRESS VINE.) 
(Quameclit vulgaris, Choisy.) 
* ‘The pollen of this species is indistinguishable from that of 
Ipomoea coccinea, except possibly in size, the spherical grains per- 
haps averaging ;1; inch in diameter. The two sizes of extinal, 
hyaline processes, and the villous covering, are similar to those of J. 
coccinea, and apparently originate in a similar manner. 
IPOM@A COCCINEA, L. 
(Quamoclit coccinea, Moench.) 
On this spherical pollen I have been able to observe, with the 
exception of the short villi clothing the general surface, only hyaline 
nipple-shaped projections of two lengths, the larger (Fig. 5) meas- 
uring z,';, inch in length, by 5, im greatest breadth, the 
smaller about one-third that size, or less. They taper gradually 
from the broad base to the obtusely rounded summit. They appear 
to originate from the extine. The villous covering is fine and in- 
conspicuous, measuring somewhat less than ,;/;,; inch in length 
from the origin of the filaments to their free extremities. The pollen 
is about 5}, inch in diameter. 
IMPOMGA PURPUREA, LAM. (COMMON MORNING GLORY. ) 
It is surprising that the pollen of so common a plant as the 
morning glory should have been examined by so many observers, 
and figured so many times, yet always to be incorrectly described 
and delineated. But such are the facts, unless Edgeworth, in his 
work on ‘“‘Pollen,” has seen the grain as it is. I have not had 
access to Edgeworth’s book, although I have searched for it in three 
large libraries in Philadelphia, after having besieged my friends and 
correspondents, in vain. In the pollen of this well-known flower the 
surface is villous, but no one has ever noticed it unless Edgeworth 
has done so. There are two kinds of papille, similar to those of 
the Ipomea Bona-nox, but all observers seem to haye seen one set 
wrong, while no one has ever seen the other, All this is curious, 
provided that I am correct in my supposition that even Edgeworth 
has missed these points, an entirely gratuitous assumption on my 
part; but the strangeness of the oversight is only equaled by the 
fact that no one has ever had a glimpse of the true structure of the 
grains, which is very similar to that of the ‘‘moon flower” pollen, the 
extine bearing conspicuous hyaline appendages, and the hair-like 
growth, while the intine, separated from it by a space ;355 inch in 
width, gives origin to short papille that project through the extine 
