306 Scientific Reviews. 
sique d’ Histoire Naturelle, in which he established several new 
orders. At home the “ English Botany” exhibits in its velumes 
nearly a complete series of the British Algw ; and though a great 
number of naturalists, even in the present day, can only see in the 
Alege fronds and seeds, the existence of a much more complex or- 
eanization has been established, and we are certain of the existence 
of roots,—of stalks analogous to those of dicoty ledonous plants,—of 
leaves similar to those of other plants, with transverse or longitu- 
dinal vessels,—and lastly, of organs of fructification, whose degree 
of complication varies with the organization of the plant. 
In alluding to Agardh’s Species Algarum, it is unnecessary per- 
haps to state, that alas work is the only complete system of Alge 
in the bends of botanists. The two sections which compose the 
first volume appeared in 162] and 1822, and contained the inarti- 
culated species. The present section is devoted to the Lemaniew, 
Ectocarpee, and Ceramiew, which include the fifteen first genera 
of the articulated Algz. We observe that the author still retains 
the name of Hutchinsia for the Polysiphonia of Greville, although 
the prior Hutchinsia of Mr. Rebert Brown has been taken up by 
Decandolle and all ether systematic botanists. Such a mode of 
proceeding cannot be admitted, simply because Professor Agardh 
is of opinion that Mr. Brown’s Hutchinsia is badly constituted. 
The volume commences with a laboured defence of the author’s 
system ; and the whole is executed in a manner that bears evidence 
ef much minute research, and of intimate acquaintance with the 
subject. 
From such a glance at the progress of the study of this interest- 
ing ae of plants, we obtain a greater sense of the value of the 
work which Dr. Greville has now presented to the public. Much 
of his leisure, during’ the last three years, has been devoted tewards 
the accum alation Of; materials, and that mostly by personal investi- 
gation. The habits of most of the species have been patiently 
watched on their native rocks, and their progress, from their first 
appearance to their perfect state, diligently marked ; and the struc- 
ture of the frond, and tbe phenomena of fruct neo, have been 
rigidly exa ned by means of the microscope. A work of this 
kinda is not capable of analysis. We have already embedied in this 
Number that part which relates to the “‘ Economical Uses of the 
Marine Alge,” and the geographical distribution of the same plants 
- is of so ace interest, that we shall further extract some of the ob- 
servations which Dr. Greville has made on this subject. 
** Phenegamous plants have furnished botanists with several grand vegetable 
regions, and a marked difference (not to specify more examples) has been recog- 
nised between the planis of America, Africa, Asia, Australia, and Europe. La- 
mouroux endeavoured to trace these great divisions among marine planes: and 
observed that the polar Atlantic basin, to the fortieth Goee of north latitude, 
presents a weil-marked vegetation. The same may be said of the. West Indian 
sea, including the Gulf of Mexico—of the eastern coast of South America—cf the 
indian Ocean and its gulfs, and of the shores of New Holland, and the neigh- 
bouring islands. ‘The Mediterranean possesses a vegetation peculiar to itself 
extending as far as the Black Sea, and uotwithstanding the geographical proxi- 
