CONTENTS 



1. FowLE, Frederick E. Smithsonian Physical Tables. Seventh 



revised edition. September, 1920. 450 pp. (Publ. no. 2539.^ 



2. GoDDARD, Robert H. A method of reaching extreme altitudes. 



December, 1919. 69 pp., 10 pis. (Publ. no. 2540.) 



3. Clayton, H. Helm. Variation in solar radiation and the 



weather. January 15, 1920. 53 pp., 5 pis. (Publ. no. 2544.) 



4. Moore, A. F. and Abbot, L. H. The brightness of the sky. 



February 4, 1920. 36 pp. (Publ. no. 2545.) 



5. Abbot, C. G. and Moore, A. F. Observations of the total solar 



echpse of May 29, 1919. January 31, 1920. 12 pp., i pi. 

 (Publ. no. 257k) 



6. De Candolle, Casimir. New species of piper from Panama. 



February 12, 1920. 17 pp. (Publ. no. 2579.) 



(v) 



