ACKNOWLEDGMENTS TO CORRESPONDENTS, FRIENDS 

 AND STRANGERS. 



Remarks. — This method of acknowledgment 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 and 

 pamphlets 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. 



In public, it is rarely proper to advert to personal concerns ; to 

 excuse, for instance, any apparent neglect of courtesy, by pleading 

 the unintermitling 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, boih 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. 



Description and use of a dipping needle deflector, invented by 

 Robt. W. Fox, Esq. From Mr. Fox. Cornwall, Eng. 



Royal Cornwall Polytechnic Society. Description of the plan 

 for descending and ascending mines, by E. O. Gregelles, C. E. 

 From Mr. Fox. 



Report of the Council of the Literary and Historical Society of 

 Quebec. From the Society. 



India Review and Journal of Foreign Sciences, edited by F. C. 

 Corbyn, Esq. Vol. II, and Nos. 23, 24, 25, of Vol. III. From the 

 editor. Received through Dr. J. V. C. Smith of Boston. 



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