13 4 REPORT OF THE SECRETARY. 



1273. Liquid Hydrogen. By Prof. James l~)e\var. From the Smithso- 

 nian Report for 1900, pages 259-264, Mith Plates I-IV. Washington: 

 Government Printing Otfice, 1901. Octavo. 



1274. A Century of Geology. By Prof. Joseph Le Conte. From the 

 Smithsonian Report for 1900, pages 265-287. Washington: Government 

 Printing Office, 1901. Octavo. 



1275. Evolutional Geology. By Prof. W. J. Sollas. From the Smith- 

 sonian Report for 1900, pages 289-314, with Plate I. Washington: Gov- 

 ernment Printing Office, 1901. Octavo. 



1276. Progress in Physics in the Nineteenth Century. By Prof. T. C. 

 Mendenhall. From the Smithsonian Report for 1900, jmges 315-331. 

 Washington: Government Printing Office, 1901. Octavo. 



1277. Electricity during the Nineteenth Century. By Prof. Elihu 

 Thomson. From the Smithsonian Report for 1900, pages 333-358. Wash- 

 ington: Government Printing Office, 1901. Octavo. 



1278. The Photography of Sound Waves and the Demonstration of the 

 Evolutions of Reflected Wave Fronts with the Cinematograph. By 

 R. W. Wood. From the Smithsonian Report for 1900, pages 359-369, 

 with Plates I- VI. Washington: Government Printing Office, 1901. Octavo. 



1279. Unsuspected Radiations. By Prince Kropotkin. From tlie 

 Smithsonian Report for 1900, pages 371-385. Washington: Government 

 Printing Office, 1901. Octavo. 



1280. Incandescent Mantles. By Vivian B. Lewes. From the Smith- 

 sonian Report for 1900, pages 387-401, with 2 text figures. Washington: 

 Government Printing Office, 1901. Octavo. 



1281. The Imperial Physico-Technical Institution in Charlottenburg. 

 By Henry S. Crahart. From the Smithsonian Report for 1900, pages 

 403-415, with Plates I-IV. Washington: Government Printing Office, 

 1901. Octavo. 



1282. The Geographic Conquests of the Nineteenth Century. By 

 Gilbert H. Grosvenor. From the Smithsonian Report for 1900, pages 

 417-430, Avith Plate I, and 12 text figures. Washington: Government 

 Printing Office, 1901. Octavo. 



1283. Through Africa From the Cape to Cairo. By Ewart S. Grogan. 

 From the Smithsonian Report for 1900, pages 431-448, with Plates I-IV. 

 W^ashington: Government Printing Office, 1901. Octavo. 



1284. The " Yermak " Ice Breaker. By Vice- Admiral Makaroff, of the 

 Russian Imperial Navy. From the Smithsonian Report for 1900, pages 

 449-459, with Plates I-III. Washington: Government Printing Office, 

 1901. Octavo. 



1285. The Growth of Biology in the Nineteenth Century. By Oscar 

 Hertwig. From the Smithsonian Report for 1900, pages 461-478. Wash- 

 ington: Government Printing Office, 1901. Octavo. 



1286. The Restoration of Extinct Animals. By Frederic A. Lucas.- 

 From the Smithsonian Report for 1900, pages 479-492, with Plates I- VIII, 

 and 2 text figures. Washington: Government Printing Office, 1901. Octavo.. 



1287. Life in the Ocean. By Karl Brandt. From the Smithsonian 

 Report for 1900, pages 493-506. Washington: Government Printing Of- 

 fice, 1901. Octavo. 



