OUTLINES OF COMPARATIVE EMBRYOLOGY; 



OR, LIFE HISTORIES OP ANIMALS, INCLUDING MAN. By A. S. PACK- 

 ARD. Copiously Illustrated. 8vo. $2.50. 



" An' ample work of reference for advanced students ..... It would not be 

 easy to find a work on the branch of AnimiJ Physiology of which it treats, which dis- 

 plays such acute and delicate analysis, or presents a more complete statement of the 

 recondite facts." Tribune. 



" Must remain for many years the one standard work on the subject. . . . Alto- 

 gether it forms one of the most valuable works of science yet published in this coun- 

 try, and it is safe to ;-ay that no working nuturalir-t can d'o without it." Prof. E. S. 



MOUSE, in Popular Xcli/uv Monthly. 



"It occupies worthily an important place absolutely unfilled to this time." Chan- 

 cellor WINCHELL. 



GUIDE TO THE STUDY OF IXSECTS, 



AND A TREATISE ON THOSE INJURIOUS AND BENEFICIAL TO CROPS. 

 For the use <>f Colleges, Farm- School*, and Agriculturists. By 

 A. S. PACKARD, M.D. With 11 Plates and 650 Woodcuts. 

 Eighth edition. $5. 



"I hold that your work ought, in connection with Harris's 'Treatise on Insects 

 Injurious to Vegetation, 1 to which it is, as it were, the key, to lie introduced in all our 

 agricultural colleges, as the best text-book of that kind now extant." Professor L. 

 AUASSIZ. 



"Your 'Guide to the Study of Insects' has become the text-book up here." G. 

 CROTCH, Librarian of Cambri/tye Unii-crdtij, England. 



" But it is of its scientific merits especially we wish to speak, and of which we can 

 speak in no qualified terms of praise. The first two parts are. we do not hesitate to 



affirm, the best things of the kind that our laniruaL'e pi>e*-e- \\'e have- 



seldom fallen on so thoroughly good a scientific treatise, and we can only conclude 

 our notice of it by advising all our natural history reader* to make it" acquaintance. 

 There is no work we should prefer to it as a book for the student "Scientific Opin- 

 ion, London. 



"Among the best guides to the study of insects which at present exist in our liter, 

 ature." Dr. A. DOHRN, in the Entomological Journal, of Stettin, Prussia. 



"The study of Entomology is one that can be almost as easily pursued in the 

 school-room as Botany, and we should be glad to see the experiment tried. Dr. 

 Packard's work is well fitted, by its clear, simple style, for use as a text-book." The 

 Michigan Teacher. 



"In typography and illustrations the part before us leaves nothing to be desired, 

 while the author's style is very perspicuous. We hope the work will be used a- 



intendeil, in colleges and farm-schools and by agriculturists In every 



particular of text, illustrations, and manufacture, it is thoroughly well done." The 

 Nation. 



" Altogether, we are immensely pleased with this work. It is assuredly, all in all, 

 the fullest, most modern, and most clearly-written treatise on insects we have ever 

 seen." Popular Science Jleview, London. 



"The- most recent memoirs connected with these subjects have been made use of 

 by the author ; and this part of his work is c-rtainly the be-t manual of entomology 

 which the English reader can at present obtain." Xafnrt, London. 



"As a practical treatise on American entomology, with reference especially to the 

 insects injurious or beneficial to crops, it stands almost alone, and reflects the hiirhest 

 credit upon American scholarship, patience, and scientific skill." New York Tribune. 



HENRY HOLT & CO., PUBLISHERS. NEW YORK. 



