42 : ‘Gn Collecting and Preserving Alga. 
lt tyon utriculatum, Roth. This plant which is one of 
st interesting of the fresh water Algee, grows abundantly 
D in ditches near the West Point Foundry. 
eh the above list it appears that the number of species of = 
Alge now known to occur in the United are is as follows: 
elanospermee, . 31 
Rhodospermee, . i i : : 59 
penned sg eae : 3 ; 82 
172 species, 
io clusive of raciaie Desmidiacese and Diatomacez. When 
it is considered that the study of our Alge has as yet hardly 
commenced, it is reasonable to expect that very large additions 
will be made by further research. 
We append to this article by Professor Bailey, a few observa- 
tions on Algee and the modes of pre — them, taken from 
*'The Dublin University Museum.”—Eps 
Directions for Collecting and Preserving Alge; by Dr. Wm. 
H. Harvey. 
(From a Report by the Directors of the Dublin University Museum.) 
“ General Character of the Alge.—The Alge vn for popu- 
lar purposes, be divided into four ‘principal groups, Viz. 
od ae tr Olive-colored Sea-weeds, which are " generality 
of large size, and leathery texture; sometimes membranaceous 
and leafy, and more rarely of a gelatinous or filamentous nature. 
“2. FLorivem, or Red-colored Sea-weeds ; cartilaginous and 
fleshy, membranous or gelatinous sea-weeds; often peace t 
of 8 red, purple, brown-red, or livid greenish-red colo 
3. CHLOROSPERMS, Or Green Sea-weeds ; membr: ‘tactic or 
filamentous ; ong somewhat horny plants, of a green color and 
simple structur 
Conners: ; vegetables coated with a crustaceous epider- 
mis composed of carbonate of lime, either red or green when 
fresh, becoming white and often brittle*on exposure to the air. 
( These must not be confounded sie the true zoophytes, which 
often assume the appearance of plants. ) 
“ Places of Growth, and Mode of Collecting.—The Alg@ are 
found, in greater or less abundance, from the extreme of high- 
water mark to the depth of from thirty to fifty fathoms. Those 
within the reach of the tide are to be collected at low water, @S- 
pecially of spring tides, the most interesting species growing fre- 
quently at the verge of low-water mark, either along the margin 
of rocks partially laid bare, or, more frequently, fringing the deep 
=. 
