"This admirable work does credit to, or should we say is worthy of, the author, the translators, and the editor. The first part treats on the artificial sources of high degrees of heat and light; the second on Spectrum Analysis in its application to the heavenly bodies. We must approve the method followed in the translation and by the editor. In many translations the views of the author are suppressed, in order that the views of the translator or editor may be expounded; but here Dr. Huggins, however leniently such a fault might have been looked upon with him, has permitted the author's views to remain intact, clearly stating his own and wherein lies the difference."--_The Chemical News._ "Certainly, as regards mere knowledge, the 'Spectrum Analysis' has let us into many secrets of the physical universe which Newton and Laplace would have declared impossible for man's intellect to attain. The science is still in its infancy, but it is prosecuted by some of the ablest, most patient, and most enthusiastic observers, and some of the keenest thinkers, at present existing on our little, insignificant physical globe."--_Boston Globe._ Studies in Spectrum Analysis. By J. NORMAN LOCKYER, F. R. S., Correspondent of the Institute of France, etc. With Sixty Illustrations. 12mo. Cloth, $2.50. "The study of spectrum analysis is one fraught with a peculiar fascination, and some of the author's experiments are exceedingly picturesque in their results. They are so lucidly described, too, that the reader keeps on, from page to page, never flagging in interest in the matter before him, nor putting down the book until the last page is reached."--_New York Evening Express._ Origin of the Stars, and the Causes of their Motions and their Light. By JACOB ENNIS. 12mo. Cloth, $2.00. Astronomy and Geology Compared. By Lord ORMATHWAITE. 18mo. Tinted paper. Cloth, $1.00. The Expanse of Heaven. A Series of Essays on the Wonders of the Firmament. By R. A. PROCTOR. 12mo. Cloth, $2.00. "'The Expanse of Heaven' can not fail to be of immense use in forwarding the work of education, even when it is read only for amusement, so forcible is the impression it makes on the mind from the importance of the subjects treated of, while the manner of treatment is so good."--_Boston Traveller._ The Moon: Her Motions, Aspect, Scenery, and Physical Conditions, with Two Lunar Photographs and many Illustrations. By R. A. PROCTOR. New edition. 12mo. Cloth, $3.50. Other Worlds than Ours; the Plurality of Worlds, studied under the Light of Recent Scientific Researches. By R. A. PROCTOR. With Illustrations, some colored. 12mo. Cloth, $2.50.