Miscellaneous. 139 
occur, for the present form of these embryos and their anatomy is 
quite as much separated from that of the adult Acteon as is that of 
a caterpillar and a butterfly. 
I will add another observation which may perhaps interest you. 
A Balanus, which I had detached with several others and preserved 
alive in a bottle, deposited in my presence a prodigious quantity of 
little ones, which came out with the stream of water which the ani- 
mal emitted at the moment of each expiration. The young barnacles 
had only one frontal eye and three pairs of natatory feet, the two 
last pairs of which were divided each into two branches. They re- 
sembled entirely Crustacea of the genus Cyclops.—Comptes Rendus, 
Oct. 6, 1845. 
HASSALL’S BRITISH ‘ FRESHWATER ALGE. 
To the Editors of the Annals of Natural History. 
GentLemen,—In the accompanying letter I have carefully abs- 
tained from any allusions which might be regarded as offensive by 
your reviewer, and have confined myself as closely as possible to a 
refutation of certain passages of the review, which, if allowed to 
pass without notice, would prove injurious to my book, and which 
are for the most part inaccurate in themselves ; I therefore trust that 
your sense of fairness will allow you to give my communication in- 
sertion in the February Number of the ‘ Annals.’ 1 should wish the 
letter to be published in full; and as no opportunity was afforded to 
me to notice the review in the same Number of the ‘ Annals’ in which 
that review appeared, none ought to be conceded to the reviewer in 
the same Number in which my letter appears*. 
I remain, Gentlemen, your obedient servant, 
~ January 3, 1846. Artuur Hint Hassa.t. 
*« Reddere cuique sua est equi bonique hominis.” 
Without wishing to charge your reviewer, in his notice of the 
“History of the British Freshwater Algz,’ with undue partiality or 
prejudice, I believe that I shall be able to show, that, on certain 
points, he has indulged in animadversion to an extent, which on a 
careful and candid examination of the work in question is not jus- 
tified. 
It is urged therein against the originality of my work, that not a 
few of the plates which illustrate it are taken from the works of other 
writers on the Algze ; and further, that, although copies, no acknow- 
ledgement of the fact: is made. 
» In answer to these statements, I beg to observe, that five only out 
of the 103 plates forming the volume of illustrations are reprints of 
plates previously published, and that each of these, bears the name 
of its original designer, ‘Thuret, Kutzing and Varley. .. ; 
» The figures of many of the Desmidie are undoubtedly taken from 
__* We are very willing to comply with the above singular request of Mr. 
Hassall, and in the mean time leave our readers to form ‘their own judge- 
ment.—Ep. 
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