ACKNOWLEDGMENTS TO CORRESPONDENTS, FRIENDS 

 AND STRANGERS. 



Remarks. — This method of acknovvledgraent has been adopt- 

 ed, because it is not always practicable to write letters, where 

 they might be reasonably expected ; and still more difficult is it 

 to prepare and insert in this Journal, notices of all the books, pamph- 

 lets, Sic, 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 j still, judicious remarks, from other hands, 

 would usually find both acceptance and insertion. 



In 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. 



SCIENCE. FOREIGN. 



Bulletin de I'Academie royale des sciences et belles lettres de 

 Bruxelles, Annee, 1842. Tom. ix, Ire partie, 2m partie, et torn, x, 

 Ire partie, de la Academic. Bruxelles. 



Nouveaux memoires de I'Academie Royale des Bruxelles, Tome 

 xvi, 1843. From the same ; received January, 1844. 



Bulletin de la Societe Geologique de France. Paris. Tome dou- 

 zierne, 1840 a 1841, de la societe. 



Annales des sciences Geologiques, publiees par M. A. Riviere 

 premiere annee. Paris. From the editor, with a proposal to ex- 

 change. 



Revue des fossiles du government de Moscow, par C. Fischer de 

 Waldheim. No, 2. Fossiles du terrain ooHthique. Extrait du 

 Bull, de la Soc. imper. des Natural, de Moscow. Tome xvi, 1843. 

 From Chas. Cramer, Esq. 



1 



