REPORT OF THE PRESIDENT, 1920. 31 



Richards, T. W., E. K. Carver, and W. C. Schumb. Effect of pressure and dissolved air and 

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, and F. Daniels. Concentrated thallium amalgams: Their electrochemical and thermo- 



chemical behavior, densities, and freezing-points. Jour. Amer. Chem. Soc, vol. 41, 1732 

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, and N. F. Hall. Melting-points and thermoelectric behavior of lead isotopes. Jour. 



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, and J. W. Shipley. Dielectric constants of typical aliphatic and aromatic hydro- 

 carbons, cyclohexane, cyclohexanone, and cyclohexanol. Jour. Amer. Chem. Soc, vol. 41, 

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Ritchie, Mart. Observations of Barnard's variable near Messier 11. Pubs. A. S. P., vol. 32, 

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RiTZMAN, E. G., and C. B. Davenport. A comparison of some traits of conformation of South- 

 down and Rambouillet sheep and of their Fi hybrids, with preliminary data and remarks on 

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Roberts, H. S., and J. C. Hostetter. The manufacture and uses of rolled optical glass. (Papers 

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Sameshima, J. See Richards, T. W. 



Sanford, Roscoe F. The spectrum of T Tauri. Pubs. A. S. P., vol. 32, 59-61 (1920). 



. Three spectroscopic binary stars. Read at Seattle meeting, A. S. P. (1920); Pubs. 



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Sarton, George. Avant Propos [du tome II]. Isis, vol. 2, 313-314 (1919). 



. War and civilization. Isis, vol. 2. 315-321 (1919). 



. La synthese geologique de 1775 k 1918. Isis, vol. 2, 357-394, 2 pis. (1919). 



. VP Bibliographie critique de toutes les publications relatives h I'histoire, la philosophic 



et I'organisation de la science (jusqu' en aout 1914). Isis, vol. 2, 429-480 (1919). 



. Secret history. Scribner's Mag., vol. 67, 187-192 (Feb. 1920). 



. Herbert Spencer. Scribner's Mag., vol. 67, 695-702 (June 1920). 



. The faith of a humanist. Isis, vol. 3, 3-6 (1920). 



. Seventh critical bil)liography of the history of philosophy and organization of science 



and of the history of civilization (to June 1919). Isis, vol. 3, 90-154 (1920). 



(editor). Isis: International review devoted to the history of science and civilization. 



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 Schultz, a. H. An apparatus for measuring the newborn. Johns Hopkins Hosp. Bull., vol. 31, 



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 Schumb, W. C. See Richards, T. W. 

 Seares, Frederick H. The surface brightness of the galactic system as seen from a distant 



external point and a comparison with spiral nebulae. Astrophys. Jour., vol. 52, 162-182 



(1920); Mt. Wilson Contr., No. 191. 

 . Magnitudes of faint comparison stars for Nova Persei, No. 2. Astrophys. Jour., 



vol. 52, 183-186 (1920); Mt. Wilson Contr., No. 192. 



. The general magnetic field of the sun. Observatory, vol. 43, 310-322 (1920). 



-, and Edwin P. Hubble. The color of the nebulous stars. Astrophys. Jour., vol. 52, 



8-22 (1920); Mt. Wilson Contr., No. 187. 

 Shapley, Harlow. Studies based on the colors and magnitudes in stellar clusters. Fifteenth 



paper: A photometric analysis of the globular system Messier 68. Astrophys. Jour., 



vol. 51, 49-61 (1920) ; Mt. Wilson Contr., No. 175. 

 . Studies based on the colors and magnitudes in stellar clusters. Seventeenth paper: 



Miscellaneous results. Astrophys. Jour., vol. 52, 73-85 (1920); Mt. Wilson Contr., No. 190. 

 . Studies of magnitudes in star clusters. X: Spectral type B and the local stellar 



system. Proc. Nat. Acad. Sci., vol. 5, 434-440 (1919) ; Mt. Wilson Communications, No. 64. 

 . Studies of magnitudes in star clusters. XI: Frequency curves of the absolute magni- 

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Mt. Wilson Communications, No. 69. 

 . Note on a simple device for increasing the photographic power of large telescopes. Proc. 



Nat. Acad. Sci., vol. 6, 127-130 (1920) ; Mt. Wilson Communications, No. 68. 

 . Themiokinetics of Liometopum apiculatum Mayr. Proc Nat. Acad. Sci., vol. 6, 



204-211 (1920). 



. On the existence of external galaxies. Pubs. A. S. P., vol. 31, 261-268 (1919). 



. Note on a sensitive spectrographic arrangement. Pubs. A. S. P., vol. 31, 278-280 



(1919). 



