1921-22.] Additions to the Library — Presentations, etc. 449 
175. Researches of the Department of Terrestrial Magnetism. 
Vol. IV. — Land Magnetic Observations, 1914-1920. By 
L. Bauer, J. A. Fleming, H. W. Fisk, and W. J. Peters. 
4to. Washington, 1921. 
258. The Federal System of the Argentine Republic. By L. S. 
Rowe. 8 VO. Washington, 1921. 
268. Olympic Victor Monuments and Greek Athletic Art. By 
Wm. W. Hyde. La. 8vo. Washington, 1921. 
273, 275. and 276. Contributions to Embryology. Vol. X, Nos. 
47 and 48; Vol. XII, No. 56; Vol. XIII, 57-64. 4to. 
Washington, 1921. 
284. The Distribution of Vegetation in the United States, as 
related to Climatic Conditions. By Burton E. Livingston 
and Forrest Shreve. 8vo. Washington, 1921. 
293. Leodicidse of the West Indian Region. Vol. XV. By Aaron 
L. Treadwell. 4to. Washington, 1921. 
294. Letters of Members of the Continental Congress. Vol. I. 
Edited by Edmund C. Burnett. 8vo. Washington, 1921. 
303. Tables, Factors, and Formulas for computing Respiratory 
Exchange and Biological Transformations of Energy. 
Prepared by Thorne M. Carpenter. 8vo. Washington, 
1921. 
305. Selection in Cladocera on the Basis of a Physiological 
Character. By Arthur M. Banta. 8vo. Washington, 1921. 
307. Growth in Trees. By D. T. MacDougal. 8vo. Washington, 
1921. 
306. Fossil Echini of the West Indies. By Robert T. Jackson and 
T. W. Vaughan. 8vo. Washington, 1922. 
308. Plant Habits and Habitats in the Arid Portions of South 
Australia. By Wm. A. Cannon. 8vo. Washington, 1921. 
309. Gaseous Exchange and Physiological Requirements for Level 
and Grade Walking. By H. M. Smith. 8vo. 1922. 
310. Displacement Interferometry applied to Acoustics and to 
Gravitation. By Carl Barus. 8vo. Washington, 1921. 
311. Shallow- Water Foraminifera of the Tortugas Region. By 
J. A. Cushman. 8vo. Washington, 1922. 
313. Rubber Content of North American Plants. By Harvey 
M. Hall and Frances L. Long. 8vo. Washington, 1921. 
314. The Behaviour of Stomata. By J. V. G. Lotfield. 8vo. 
Washington, 1921. 
315. Aeration and Air-Content: The Role of Oxygen in Root 
Activity. By F. E. Clements. 8vo. Washington, 1921: 
316. Development and Activities of Roots of Crop Plants : A 
Study in Crop Ecology. By J. E. Weaver, F. C. Jean, 
J. W. Crist. 8vo. Washington, 1922. 
320. Genetic Studies of Rabbits and Rats. By W. E. Castle. 
8vo. Washington, 1922. 
VOL. XLII, 
29 
