1824.] Dr. Berger's reply to Mr. Henslow. 367 



for which, on account of its form, it might be mistaken, and 

 does not resemble any other mineral with which 1 am acquainted, 

 I have, therefore, named it Nuttallite, out of respect to the 

 gentleman who brought it to this country. 



I hope at some future time to be enabled to describe it 

 more fully than I do from the minute crystals my specimen 

 contains. 



Article XI. 



Reply to Mr. Henslow's Observations on Dr. Berger's Account 

 of the Isle of Man. By J. F. Berger, MD. 



(To the Editor of the Annals of Philosophy.) 



SIR, Geneva, March 9, 1824. 



Being engaged a short time since in some researches at the 

 public library of our city, I there met with the second part of the 

 fifth volume of the Transactions of the Geological Society of 

 London, the 27th article of which is entitled Supplementary 

 Observations to Dr. Berger's Account of the Isle of Man, by 

 J. S. Henslow, Esq. MGS. Unless I deceive myself it is the 

 business of him whom a criticism especially concerns, either to 

 profit by a reasonable and impartial criticism, or to animadvert 

 upon that which is not true, or dictated by the malignity of 

 envy. 



The charge of having published a memoir from " loose memo- 

 randa,* is of so grave a nature, that Mr. Henslow ought to have 

 satisfied himself that it was well founded, or to have named the 

 persons from whom he received the information.f If Mr. H. had 

 taken the trouble to write to me upon this subject, I should have 

 replied, without in any way discouraging a criticism upon a pub- 

 lished memoir, that I had remained in the Isle of Man only from 

 the 1st of June until the 8th of July, 1811, and that it was on my 

 return from Ireland to London, in the beginning of 1813, that I 

 drew up the memoir published in the second volume of the Trans- 

 actions of the Geological Society, from notes actually made on the 

 spot ; and with the exception of Mr. Thomas Webster, Draughts- 

 man to the Society, I have no recollection that any member of 

 the Society ever saw these notes, for no opportunity of showing 



" After having finished, ah much as depended upon myself, the geological examination 

 of thus Isle, fearing that my notes originally written in pencil, might be obliterated, it 

 occurred to mc to fix the plumbago upon the paper by a process well known to artists, 

 by moistening witli a sponge dipped in milk, the leaves of my book, which I unsewed, 

 and which from that time were louse sheds. 



t Nc quid falsi audcal, ne quid veri nun audcut dkerc. 



