158 Scientific Intelligence. 



Quarto, pp. 364; 25 plates, 6 figs. Vol. XIII, Nos. 57-64. Pp. 

 146 ; 20 plates, 25 figs. 



No. 284. Distribution of Vegetation in the United States as 

 related to climatic conditions; by B. E. Livingston and Forrest 

 Shreve. Pp. xvi, 590; 73 plates, 74 figs., 152 tables. 



No. 293. Leodicidas of the "West Indian Region; by A. L. 

 Treadwell. Quarto, pp. iv, 131; 9 plates, 467 figs. 



No. 303. Tables, Factors and Formulas for computing respira- 

 tory exchange and biological transformation of energy ; prepared 

 by T. M. Carpenter, Pp. 123; 33 tables with introduction 

 explaining description and use. 



No. 305. Selection in Cladocera on the basis of a physiological 

 character ; by Arthur M. Banta. Pp. 170 ; 18 figs., 49 tables. 



No. 307. Growth in Trees; by D. T. MacDougal. Pp. 41; 

 16 figs. 



No. 310. Displacement Interferometry applied to acoustics 

 and to gravitation; by Carl Barus. Pp. viii, 149; 183 figs. 



No! 313. Rubber- Content of North American Plants; by 

 Harvey M. Hall and Frances E. Long. Pp. 65; 3 plates. 



No. 315. Aeration and Air-Content : The Role of Oxygen in 

 Root Activity; by Frederic E. Clements. Pp. 183. 



•Also a Classified list (with prices) of publications of the Car- 

 negie Institution, dated February 15, 1921. 



4. Report of the Librarian of Congress, Herbert Putnam, 

 and Report of the Superintendent of the Library Building and 

 Grounds, F. L. Averill, for the year ending June 30, 1921. 

 Pp. 207, with 6 full page illustrations. Washington, D. C. — 

 The striking point made by Mr. Putnam is one already urged, 

 namely a thorough readjustment of the salary schedule. The 

 lack of this is causing a serious loss in the staff through resigna- 

 tions. A small number of additional assistants and clerks is also 

 needed to make the organization more perfect. The sum called 

 for by these needs is $170,930 ; deducting present bonuses, the 

 net increase is $83,330. The library continues to gain in num- 

 bers, the number of books added for the year being 86,923. 

 Besides these, manuscripts, maps and charts, music and prints 

 have been obtained by gift or purchase. Many of these are 

 described in detail. ■ 



