76 Scientific Intelligence. 



dix No. 12.— Report for 1893, pt. 2, pp. 513-639, plates 22-37.) 

 Washington, 1894. In this report the mean density of the earth 

 is calculated from observations of the force of gravity at two sta- 

 tions (Waiau and Kawaihae) on the Island of Hawaii in compari- 

 son with the density of Mauna Kea, determined from specimens 

 whose specific gravity was measured by G. P. Merrill of the 

 Smithsonian Institution and E. S. Dana (this Journal, vol. xxxvii, 

 p. 442 and 447) to be in relation to the density of the mountains 

 as 1*77 to 1, the density of the mountain being assumed to be 

 2 # 90 ; this gives mean density of the earth = 5*13. 



5. Relative Schwerebestimmungen durch Pendelbeobachtungen : 

 ausgeftlhrt durch die K. und K. Kriegs-marine in den Jahren 

 1892-1894. 630 pp. with 5 plates. — The results of a long series 

 of pendulum observations carried through by the Austrian Gov- 

 ernment between the years 1892 and 1894 are here presented in 

 full tabular form with explanations as to the instruments employed, 

 etc. The stations occupied include a large number on both east 

 and west shores of the Adriatic sea and a series of others at 

 widely separated points distributed over the world at large. 



6. Elementary Physical Geography, by Ralph S. Tare. 488 

 pp. 8vo. New York and London, 1895. (Macmillan & Co.)— The 

 author has given here a clear and interesting presentation of the 

 various topics commonly included under the general head of 

 Physical Geography. So many different branches of science have 

 to be touched upon that in an elementary work like the one in 

 hand, the treatment is of necessity often superficial. In the 

 main, however, good judgment is used in the choice of matter and 

 the work as a whole will be found a highly valuable contribution to 

 the available text-books in a field not before well occupied. In 

 the matter of illustrations the author has shown commendable 

 enterprise ; they are numerous, well selected from many sources 

 and with few exceptions very satisfactorily reproduced. 



7. The Herschels and Modern Astronomy ; by Agnes M. 

 Clerke, New York, pp. 224, 12mo, 1895. (Macmillan & Co.) 

 Century Science Series, vol. iii. — The life of John Herschel has 

 never been written, and the wonderful series of papers which the 

 elder Herschel contributed through a series of years to the Phil- 

 osophical Magazine have never been collected and republished, 

 yet the lives and works of both are so well known that the pres- 

 ent volume offers little that is new ; nevertheless, being written by 

 Miss Clerke, it will prove both interesting and profitable to lay- 

 men and specialists alike. w. b. 



8. Justus von Liebig, His Life and Work / by W. A. Shen- 

 stone, pp. 219. (Macmillan & Co., $1.25.) — More than twenty 

 years after Liebig's death, this essay appears as the first com- 

 prehensive and popular account of his scientific career. The 

 author justly considers the subject of his work as one of the 

 greatest men of this or, perhaps, any other century. He was 

 the pioneer in four great departures in science, in organic 

 chemistry, in the application of chemistry to agriculture and to 



