NATURAL AND MORAL PHILOSOPHY. 
INQUIRIES CONCEENING THE INTELLECTUAL POW- 
ERS, AND THE INVESTIGATION OF TRUTH. By John Abeb- 
CHOMBiE, M.D., F.R.S. 18mo. [With Questions.] 
THE PHILOSOPHY OF THE MORAL FEELINGS. 'By 
John Abeecrombie, M.D., F.R.S. 18mo. 
In the performance of his undertaking the accomplished author exhibits the posses- 
sion of a mind thoroughly versed in the details of the science to which his attention is 
directed, and familiar with abstract inquiry. His descriptions of the mental phenom- 
ena are singularly lucid, precise, and interesting, and his reasonings sound, original, 
and perspicuous. Above all, he has exhibited philosophy as the handmaid of re- 
ligion, and made it manifest that all the rays of knowledge naturahy converge 
towards that one point in which is situated the throne of heavenly and eternal truth. 
The most able and influential reviews, both of England and the United States, 
have given the strongest encomiums to this admirable work, and it has been 
extensively adopted in our colleges and higher establislunents for education. 
LETTERS OF EULER ON DIFFERENT SUBJECTS IN 
NATURAL PHILOSOPHY. Addressed to a German Princess. Translated 
by Hunter. With Notes and a Life of Euler, by Sir David Brewster, LL.D. 
With additional Notes, by John Gktscom, LL.D. With a Glossary of Scientific 
Terms. In 2 vols. 18mo. With Engravings. 
Of all the treatises on Natural Pliilosophy that have been published in the various 
languages of Europe there as none that has enjoyed a more extensive and permanent 
celebrity than tliat of the famous mathematician and philosopher Leonard Euler, 
contained in his letters to the Princess of Anhalt. They have been translated into 
several tongues, and edition after edition has been published in Europe with still 
increasing reputation. The most eminent savans of England and France have 
repeatedly borne testimony to their excellence, not only by the strongest expressions 
of approbation, but by assuming the task of editing the work : the latest who has 
bestowed this mark of commendation was Sir David Brewster, from whose edition 
this now published was printed. The notes added by him are copious and valuable ; 
and the pubhshers of the American edition, still more to enhance the merit of the 
work, have secured the assistance of Professor Griscom, whose notes will be found 
numerous and of great utility. 
LETTERS ON NATURAL MAGIC. Addressed to Sir Wal- 
ter Scott, Bart. By Sir David Brewster, K.H., LL.D. IBmo. With En- 
gravings. 
The author of this volume passes under review the principal phenomena of nature, 
and the leadmg contrivances of art which bear the impress of a supernatural character, 
and more especially those singular illusions of sense in which the most perfect organs 
fail to perform their functions, or perform them unfaithfully. These are themes full of 
interest, and worthy of the labour bestowed upon them by the philosophic writer. 
The eye and ear are, of course, the chief organs of deception, and, accordingly, 
optical illusions occupy a considerable portion of the volume. Those depending on 
the ear succeed, and, after these have been described and explained, we are entertamed" 
with amusing accounts of feats of strength, of m.echanical automata, and of some of 
the more popular wonders of chymistry. Under each of these divisions anecdotes of 
the most interesting kind illustrate the author's explanations, and no subject in itself 
grave and important was ever treated in a more captivatmg manner. 
ON THE IMPROVEMENT OF SOCIETY BY THE DIF- 
FUSION OF KNOWLEDGE : or, an Illustration of the Advantages which 
would result from a more General Dissemination of Rational and Scientific In- 
formation among all Ranks. By Thomas Dick, LL.D. ISmo. With 
Engravings. 
