Prop ropagation of marine Plants. > -> rg 
_ is fo carefully enveloped with an impenetrable barrier, formed by 
the concave pofition of the leaves, that the pollen is enabled to con- 
vey its fertilizing vapour in an element, which by contact would: 
obftrué the progrefs of fecundation. The genus Chara feems to in- 
dicate an approach towards that terminating point, where the me- 
chanical florefcence ceafes at length to act. Some refpectable au- 
thors, and Haller among the number, do not admit that the fup- 
pofed antherx can be invefted with the faculty of impregnation, 
becaufe they are permanently included in an impervious part of the 
plant. Hedwig, who has defined the florefcence of this genus with 
great precifion, acknowledges himfelf to be totally at a lofs to ac- 
count for that operation, becaufe the fpherical veffel, in which the 
anthere* are included, has no external communication with the 
| approximating germ. It is very pn , however, that the veffel 
alluded to may, from its contiguity-to the duret part of the germ, 
convey thither, at the point of contact, the impregnation by an in- 
pee: procefs. A vaj Sinni pepon will at once teg "s 
: he veffe! ps de iita which tlie (e Mii n a ip ars to 
a ahead’ on internally, and thofe air-bladders in fome of the Å k A 
fuppofed to be the refidence of the male flower. 
. Enough has already been faid upon. the Linnean ftate of. Borel- 
cence. We have a clear and re(tri&ed definition of its conftituent 
parts, while its laws are found to accord with furprifing uniformity 
ugh all the various claes, which were formed by the great 
founder of the fyftem. Yet there is a point where its accu hoes 
mechanifm ceafes.to a& ; where the nature and agency of its impreg- 
nating powers undergo a: material change. And here furely we 
may paufe, to tont wipes the verfatile | power by visit p is 
T Uem didus pm E ibid 
m deque 
