Miscellaneous. 139 



occur, for the present form of these embryos and their anatomy is 

 quite as much separated from that of the adult Actaon 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 gftuus Cyclop^.r^Qpmptes Rendus, 

 .Oct. 6, 1845. 5j„^ j 



HASSALl's BRITISH * FRESHWATER ALGJE.* 



fo^^fffns jiq ff^g 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,' I 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 ia 

 the same Number in which my letter appears*. ^g '^jnBi 



I remain. Gentlemen, your obedient servant, ,- .?;,, 



January 3, 1846. Arthur Hill Hassall. 



" Reddere cuique sua est sequi bonique horainis." 



Without wishing to charge your reviewer, in his notice of the 

 * History of the British Freshwater Algae,' 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 Algae ; 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, Kiitzing and Varley. 



The figures of many of the Desmidia 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. — Ed. 



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