REdOMME^^DATORY NOTICES. 



OPINION OF THOMAS STEWARDSON, M. D. 

 One of the Physicians of the Pennsylvania Hospital. 



Philadelphia. Feb. 2, le-iC. 

 Messrs. Turner & Fisher. 

 Gentlemen, — I have exatriined with much pleasure Dr. Ruschenberger's 

 " Second Book of Natural History" and feel satisfied that it is admirably 

 adapted to become a text book in schools and colleges. — The publication of 

 such a work has long been a consideration, not only for teachers and their 

 pupils, but generally for those persons who without possessing sufficient time 

 or inclination to enter deeply into the study of natural history, would never- 

 theless be glad to become acquainted with its elements, if they could do so 

 by the perusal of a book which lilie the present is at once clear and concise, 

 at the same time that it contains much interesting information in reference 

 to the habits etc. of some of the most common and useful animals. 

 Wisliing you entire success in your most useful enterprise, 

 I remain, yours, lScc. 



THOMAS STEWARDSON. 



OPINION OF JOHN F. BROOKE, M. D. 



Surgeon : U. S, Navy. 



Philadelphia, Jan. 2Sth, 1842. 

 Messrs, Turxer & Fisher. 

 Gentlemen, — I have read with pleasure Dr. Ruschenberger's new work upon 

 Natural History, which embraces the Quadrupeds, and am of opinion, that 

 it is one of the best elementary works we have, and will be highly useful in 

 oar schools and colleges. Very respectfully, &c. 



JOHN^F. BROOKE. 



OPINION OF JOHN STYLES, M. D. 



New York, Feb. 1st, 1842. 

 Messrs. Turner «fe Fisuer. 



Gentlemen, — I am happy to find that my expectations in Dr. Ruschen- 

 berger's series of Elementary Books have been so well realised in the success 

 which your first publication, "Physiology and Animal Mechanism" has 

 met with. 



The extent of its circulation and the encomiums bestowed on it, by those 

 best qualified to appreciate it are altogether ample proofs of its usefialness — 

 as well as that the talents and industry which the Dr. has brought to bear 

 upon the undertaking have not been misapplied, 



I have attentively examined the Second Book, — " Mammalogy," and readily 

 tender you the small tribute of my praise to its merits. In the unpretend- 

 ing form of a school book, wc have here the condensed matter of voluminous 

 systems — and so admirably arranged that, by the aid of its classification, 

 much of the difficulty inseparable from the commencement of a new study 

 is, I think, as far as can be, obviated. 



To the student it must be a valuable acquisition, and if I mistake not, to 

 those more advanced, it will be equally useful as a text book or vade mecum 



the branch it treats of. 

 •• I consider that Dr. Ruschenberger will by these little works very essen- 

 tially promote our means of instruction, and on the completion of the ' series' 

 materially aid in diffusing by its means a general taste for the study of 

 •Natural Science — of his ability to carry out the plan we have already ample 

 • proof before us, and may therefore justly anticipate the best results to its 

 onward progress. Yours; respectfully, 



JOHN STYLES. 



