Valuable 0r{jaol Books. 



BLAKE'S FIRST BOOK IN ASTRONOMY. Designed for 

 the Use of Common Schools. By J. L. BLAKE, D.D. Illustrated by 

 Steel Plate Engravings. 8vo. cloth back. Price 50 cents. 



From E. Hinckley, Professor of Mathematics in Maryland University. 



" I am much indebted to you for a copy of the First Book in Astronomy. It is a work 

 of utility and merit, far superior to any other which I have seen. The author has selected 

 his topics with great judgment, arranged them in admirable order, exhibited them in 

 a style and manner at once tasteful and philosophical. Nothing seems wanting, nothing 

 redundant It is truly a very beautiful and attractive book, calculated to afford both 

 pleasure and profit to all who may enjoy the advantage of perusing it." 



From B. Field, Principal of the Hancock School, Boston. 



" I know of no other work on Astronomy so well calculated to interest and instruct 

 young learners in this sublime science." 



From James F. Gould, A.M., Principal of the High School for Young Ladies, 



Baltimore, Md. 



" I shall introduce your First Book in Astronomy into my Academy in September, 

 consider it decidedly superior to any elementary work of the kind I have ever seen." 



From Isaac Foster, Instructor of Youth, Portland. 



" I have examined Blake's First Book in Astronomy, and am much pleased with it. A 

 very happy selection of topics is presented in a manner which cannot fail to interest the 

 learner, while the questions will assist him materially in fixing in the memory what ought 

 to be retained. It leaves the most intricate parts of the subject for those who are able to 

 master them, and brings before the young pupil only what can be made intelligible and 

 interesting to him." 



" The illustrations, both pictorial and verbal, are admirably intelligible ;' and the defini- 

 tions are such as to be easily comprehended by juvenile scholars. The author has inter- 

 woven with his scientific instructions much interesting historical information, and con- 

 trived to dress his philosophy in a garb truly attractive. JV. Y. Daily Evening Journal. 



"We are free to say, that it is, in our opinion, decidedly the best work we have any 

 knowledge of, on the sublime and interesting subject of Astronomy. The engravings are 

 executed in a superior style, and the mechanical appearance of the book is extremely 

 prepossessing. The knowledge imparted is in language at once chaste, elegant, and 

 simple adapted to the comprehension of those for whom it was designed. The subject 

 matter is selected with great judgment, and evinces uncommon industry and research. 

 We earnestly hope that parents and teachers will examine and judge for themselves, as 

 we feel confident they will coincide with us in opinion. We only hope the circulation of 

 the work will be commensurate with its merits." Boston Evening Gazette. 



" The book now before us contains forty-two short lessons, with a few additional ones 

 which are appended in the form of problems, with a design to exercise the young learner 

 in finding out the latitude and longitude on the terrestrial globe. We do not hesitate to 

 recommend it to the notice of the superintending committees, teachers, and pupils of our 

 public schools. The definitions in the first part of the volume are given in brief and clear 

 language, adapted to the understanding of beginners." State Herald, Portsmouth, N. H. 



BLAKE'S NATURAL PHILOSOPHY. Being Conversations on 

 Philosophy, with the addition of Explanatory Notes, Questions for Exami- 

 nation, and a Dictionary of Philosophical Terms. With twenty-eight steel 

 Engravings. By J. L. BLAKE, D.D. 12mo. sheep. Price 67 cents. 



*** Perhaps no work has contributed so much as this to excite a fondness for the study 

 of Natural Philosophy in youthful minds. The familiar comparisons, with which it 

 abounds, awaken interest, and rivet the attention of the pupiL 



From Rev. J. Adams, President of Charleston College, S. O. 



"I have been highly gratified with the perusal of your edition of Conversations on 

 Natural Philosophy. The Questions, Notes, and Explanations of Terms, are valuable 

 additions to the work, and make this edition superior to any other with which I am 

 acquainted. I shall recommend it wherever I have an opportunity." 



" We avail ourselves of the opportunity furnished us by the publication of a new edition 

 of this deservedly popular work, to recommend it, not only to those instructors who may 

 not already have" adopted it, but also generally to all readers who are desirous of obtaining 

 information on the subjects on which it treats. By Questions arranged at the bottom of 

 the pages, in which the collateral facts are arranged, he directs the attention of the learner 

 to the principal topics. Mr. Blake has also added many Notes, which illustrate the pas- 

 sages to which they are appended, and the Dictionary of Philosophical Terms is a useful 

 addition." U. S. 'Literary Gazette. 



