We have much pleasure in commending this series of works — the third of 

 which, now before us, is on Ornithology. It will be found useful in the school- 

 room, or the private study. — U. S. Gazette. 



DR. RUSCHENBERGER'S ELEMENTS OF HERPETOLOGY AND 

 ICHTHYOLOGY. 



The Natural History of Reptiles and Fishes ; for beginners; 66 illustra- 

 tions. 1 vol. 12mo. 



Ruschenberger's Series of Books on Natural History are among the most valu- 

 able and useful works, for the use of Schools, that have ever been published. A 

 knowledge of Natural History is not only valuable, but deeply interesting ; and no 

 one's education can, with such facilities as these works afford, be considered com- 

 plete without it. — National Intelligencer. 



DR. RUSCHENBERGER'S ELEMENTS OF CONCHOLOGY. 



The Natural History of Shells and Mollusca; for beginners; 119 illustra- 

 tions. 1 vol. 12mo. 



" We have no hand-books equal to these ; and we think Dr. R. has conferred 

 an obligation upon teachers and learners by producing them in an English dress, 

 with all the advantages of well-engraved illustrations. The whole set of this 

 work, which is furnished at a low price, will prove an invaluable acquisition to the 

 school library." 



DR. RUSCHENBERGER'S ELEMENTS OF ENTOMOLOGY. 



The Natural History of Insects; for beginners; 91 illustrations. 1 vol. 12mo. 



The subjects are well treated ; and from the exceeding cheapness and admirable 

 arrangement of these elementary works, they are well fitted for general use in 

 Public Schools, Academies, and in every private library. — New York American. 



DR. RUSCHENBERGER'S ELEMENTS OF BOTANY. 



The Natural History of Plants; for beginners; 194 illustrations. 1 vol. 

 12mo. 



We do not hesitate to say, that this is the best work of the kind and dimensions 

 that has ever fallen under our notice. We hope all will embrace the first oppor- 

 tunity of procuring a copy, as we are sure they will prize it highly. — Botanic 

 Recorder. 



We regard this series as eminently useful, supplying adequately the instruction 

 in Natural History necessary to a proper school education. — North American. 



DR. RUSCHENBERGER'S ELEMENTS OF GEOLOGY. 



The Natural History of the Earth's Structure; for beginners; illustrated 

 with 300 beautiful Wood-cuts, designed to assist the learner in the 

 course of his studies. 1 vol. 12mo. 



" We agree with a competent judge in the opinion, that it is the most complete 

 and beautiful Elementary Treatise on the subject which has been published in this 

 country. The subject of Geology is now attracting a great deal, and will continue 

 to excite still more attention in the United States, as our vast mineral resources 

 are becoming more fully developed; and this work exactly suits the wants of the 

 public, in training up the young for future study in this branch of knowledge." 



The series of books of which this forms a part has been highly and justly com- 

 mended by the ablest judges, as furnishing rare facilities for the acquisition of 

 branches of knowledge, but too much neglected in our schools. We have ex- 

 amined the volumes with much care, and we find them well deserving all th* 

 praise bestowed on them. — Godey's Lady's Boole. 



