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ACKNOWLEDGMENTS TO CORRESPONDENTS, FRIENDS 
_ : AND STRANGERS. 
; * 
Ks. This ‘method of acknowledgment thas been adopt- 
et Say it is not always practicable to write letters, where 
. they ‘might be reasonably expected 3 and still more difficult is it 
__ to prepare and insert in this Journal, notices of all the books, pamph- 
lets, &c., which are kindly presented, even in cases, where such no- 
_ tices, critical or commendatory, would be appropriate ; for it is often 
equally impossible to command the time requisite to frame them, or 
even to read the works; still, judicious remarks, from other hands, 
would usually find both acceptance and insertion. 
n public, it is rarely proper to advert to personal concerns; to 
excuse, for instance, any apparent neglect of courtesy, by pleading 
the unintermitting pressure of labor, and the numerous calls of our 
fellow-men for information, advice, or assistance, in lines of duty, 
with which they presume us to be acquainted. 
The apology, implied in this remark, is drawn from us, that we may 
not seem inattentive to the civilities of many respectable persons, au- 
thors, editors, publishers, and others, both at home and abroad. ° It 
is still our endeavor to reply to all letters which appear to require an 
answer ; although, as a substitute, many acknowledgments are made 
in these pages, which may sometimes be, in part, retrospective.— 
Eds. 
> 
Pe s 
sc ee -——FOREIGN. 
Géologie des Gens du 2k. par K. C. de Leonhard * Hei- 
delberg ;- translated from the German by P. Grimblot and P. A. 
‘Toulougan. omé deuxieme. Paris, 1840. From the Author. 
Lethea Geognostica ; feuilles 13 and 14 of text, and Taf 13, 14, 
16, 17, 18, 20, 21, 20 ‘and 24. From the ‘Author. 
Neues Sabrhach fir Mineralogie, &c. 1833, Heft. s rag 6. 
1838, Heft. 1,4, 5,6. From Messrs. Leonhard and Bro 
everal German Catalogues of Books, for sale by Nextlor & Mel- 
le, Hamburg. From M. 
Hisicire Ricaiie. des Poissons d’Eau Douce de L’ Europe Cen- 
trale, ivraison, contenante les Salmones, folio, 
Agassiz. 
With peau colored ‘ies — the Author. 
* 
x 
