VALUABLE SCIENTIFIC ^'ORKS. 



PRINCIPLES OF ZOOLOGY: touching the Structure, Development, 

 Distribution, and Natural Arrangement of the Races of Animals, living and extinct. 

 With numerous Illustrations. For the Use of Schools and Colleges. Part 1., COMPARA- 

 TIVE PHYSIOLOGY. By Louis AGASSIZ and AUGUSTUS A. GOULD. Revised 

 Edition. 12mo, cloth, 1,00. 



This work places us in possession of information half a century in advance of all our elementary 

 works on this subject. . . No work of the same dimensions has ever appeared in the English lan- 

 guage containing so much new and valuable information on the subject of which it treats. - PKOF. 

 JAMES HALL. 



A work emanating from so high a source hardly requires commendation to give it currency. The 

 Tolume is prepared for the student in zoological science; it is simple and elementary in its style, full 

 in its illustrations, comprehensive in its range, yet well condensed, and brought into the narrow com- 

 pass requisite for the purpose intended. Silhman's Journal. 



The work may safely be recommended as the best book of the kind in our language. Christian 

 Examiner. 



It is not a mere book, but a work - a real work, in the form of a book. Zoology is an interesting 

 science, and is here treated with a masterly hand. The history, anatomical structure, the nature and 

 habits of numberless animals, are described in clear and plain language, and illustrated with innumer- 

 able engravings. It is a work adapted to colleges and schools, and no young man should be without 

 it. Scientific American. 



PRINCIPLES OF ZOOLOGY, PART II. Systematic Zoology, in 



o^ i 



which the Principles of Classification are applied, and the principal Groups of Animals 

 are briefly characterized. With numerous Illustrations. 12mo, in preparation. 



THE ELEMENTS OF GEOLOGY; adapted to Schools and Colleges, 

 with numerous Illustrations. By J R. LOOMIS, late Professor of Chemistry and Geology 

 in Waterville College. 12mo, cloth, 75. 



After a thorough examination of the work, we feel convinced that in all the requirements of a text 

 book of natural science, it is surpassed by no work before the American public. In this opinion we 

 believe the great body of experienced teachers will concur. The work will be found equally well 

 adapted to the wants of those who have given littla or no attention to the science in early life, and are 

 desirous to become acquainted with its terms and principles, with the least consumption of time and 

 labor. We hope that every teacher among our readers will examine the work and put the justness 

 of our remarks to the test of his judgment and experience. M. B. ADDERS ON, Pres. of Rochester 

 University. 



Tliis is just such a work as is needed for our schools. It contains a systematic statement of the 

 principles of Geology, without entering into the minuteness of detail, which, though interesting to the 

 mature student, confuses the learner. It very wisely, also, avoids those controverted points which 

 mingl" geology with questions of biblical criticism. We see no reason why it should not take its 

 tf'.ace as a text book in all the schools in the land. N. Y. Observer. 



This volume merits the attention of teachers, who, if we mistake not, will find it better adapted to 

 Ihi'ir purpose than any other similar work of which we have knowledge. It embodies a statement 

 C' the principles of Geology sufficiently full for the ordinary purposes of instruction, with the leading 

 facts from which they are deduced. It embraces the latest results of the science, and indicates the 

 debatable points of theoretical geology. The plan of the work is simple and clear, and the style in 

 which it is written is both compact and lucid. We have special pleasure in welcoming its appearance. 

 Watchman and Reflector. 



This volume seems to be just the book now required on geology. It will acquire rapidly a circula- 

 tion, and will do much to popularize and universally diffuse a knowledge of geological truths. Al- 

 bany Journal. 



It gives a clear and scientific, yet simple, analysis of the main features of the science. It seems, in 

 lansuage and illustration. admirably adapted for use as a text book in common schools and academies; 

 While it is vastly better than any thing which was used in college in our time. In all these capacities 

 We particularly and cordially recommend it. Conaregationalist, Boston. I> 



