WORKS OF BICHABD ABTHOKT PKflCTOH. 



OTHER WORLDS THAN OFRS: The Plnrality of Worlds, studied 

 under the Light of Recent Scientific Researches. With inustrations, 

 some colored. 12mo. Cloth. Price, $2.50. 



LIGHT SCIENCE FOR LEISURE HOURS. A Series of Familiar 

 Essays on Scientific Subjects, Natural Fhenomena, etc. 1 vol., 

 12mo. Cloth. Price, |1.7d. 



ESSAYS ON ASTRONOMY. A Series of Papers on Planets and Mete- 

 ors, the Sun, Stars, etc. With 10 Plates and 24 Wood Engravings. 

 1 vol., 8vo. Cloth. Price, $4.50. 



THE MOON: her Motions, Aspect, Scenery, and Physical Conditions. 

 With Three Lunar Photographs, and many Plates, Charts, etc. 1 

 vol., 8vo. Cloth. Price, $5.00. 



THE EXPANSE OF HEAVEN. A Series of Essays on the Wonders 

 of the Firmament. 1 vol., I2mo. Cloth. Price, $2.00. 



OUR PLACE AMONG INFINITIES. A Series of Essays contrasting 

 our Little Abode in Space and Time with the Infinities around us. 

 To which are added Essays on the Jewish Sabbath and Astrology. 

 1 voL, 12mo. Cloth. Price, $1.75. 



HELMHOLTZ (H.), Professor of Physics in the University of Berlin. 

 Popular Lectures on Scientific Subjects. Translated by E. Atkinson, 

 Ph.D., F.C.S. With an Introduction by Prof. Tyndall. 12mo. 

 Cloth. Price, $2.00. 



D. APPLETON & CO., 549 & 551 Broadway, New York. 



