REPORT OF THE PRESIDENT, 1922. 29 



Riddle, Oscar. Identical twins in pigeons arise from ova of markedly aberrant size. Proc. 



Soc. Exper. Biol, and Med., vol. 19, 12-14 (Oct. 1921). 

 . Incidence of tuberculosis in the various organs of the pigeon. Jour. Infect. Dis., vol. 



29, No. 5, 544-552 (Nov. 1921). 

 . A simple method of obtaining premature eggs from birds. Science, n. s., vol. 54, 



No. 1409, 664-666 (Dec. 1921). 

 . An undescribed relation of the suprarenals to ovulation. Proc. Soc. Exper. Biol, and 



Med., vol. 19, 280-282 (Mar. 1922). 

 See Honeywell, H. E. 



Roberts, H. S. A furnace temperature regulator. Jour. Wash. Acad. Sci., vol. 11, 401-409 (1921) ; 



97-118 (1922); Mt. Wilson Contr., No. 235. 

 , and L. H. Adams. The use of minerals as radio detectors. Amer. Mineralogist, vol. 



7, 131-136 (1922). 



See Hostetter, J. C. 



Root, H. F. See Miles, W. R. 



Rowe, Allan W. See Richards, Theodore W. 



Rot, Arthur J. Systematic corrections and weights of catalogues: An extension of tables in 



Appendix III of Boss's P. G. C. (1921). 

 Russell, Henry Norris. On the accuracy with which mean parallaxes can be determined 



from parallactic and peculiar motions. Astrophys. Jour., vol. 54, 140-145 (1921); Mt. 



Wilson Contr., No. 215. 

 . On Majorana's theory of gravitation. Astrophys. Jour., vol. 54, 334-346 (1921); Mt. 



Wilson Contr., No. 216. 

 . Note on cooling by expansion in sun-spots. Astrophys. Jour., vol. 54, 293-295 (1921); 



Mt. Wilson Contr., No. 217. 

 . The theory of ionization and the sun-spot spectrum. Astrophys. Jour., vol. 55, 119-144 



(1922); Mt. Wilson Contr., No. 225. 

 . On the calculation of masses from spectroscopic parallaxes. Astrophys. Jour., vol. 



65, 238-241 (1922) ; Mt. Wilson Contr., No. 227. 

 . Notes on ionization in the solar atmosphere. Astrophys. Jour., vol. 55, 354-359 



(1922); Mt. Wilson Contr., No. 236. 



Dark nebulae. Proc. Nat. Acad. Sci., vol. 8, 115-118 (1922); Mt. Wilson Communica- 



tions, No. 77; Nature, vol. 110, 81-83 (1922). 



Sabin, F. R. On the origin of the cells of the blood. Physiol. Rev., vol. 2, 38-69 (1922). 



. Studies on blood. The vitally stainable granules as a specific criterion for erythroblasts 



and the differentiation of the three strains of the white blood-cells, as seen in the living 

 chick's yolk-sac. Johns Hopkins Hosp. Bull., vol 32, 314-321 (1921). 



Sanford, Roscoe F. The orbits of the spectroscopic binaries 1 Hydra? and 75 Cancri. Astro- 

 phys. Jour., vol. 55, 30-55 (1922); Mt. Wilson Contr., No. 221. 



. On the period of Capella. Pubs. A. S. P., vol. 34, 178-179 (1922). 



. Spectrogram of the nebula N. G. C. 2681. Pubs. A. S. P., vol. 34, 222 (1922). 



. Orbits of three spectroscopic binaries. Read at Middletown meeting, Amer. Astron. 



Soc. (1921); Pop. Astron., vol. 30, 7-8 (1922). 



Sarton, George. Evariste Galois. Scientific Monthly, vol. 13, 363-375 (Oct. 1921). 



— . Introduction to the history and philosophy of science (preliminary note). Isis, vol. 4, 



23-31 (1922). 



. The principle of symmetry and its applications to science and to art. Isis, vol. 4, 



32-38 (1922). 



. Tenth and eleventh critical bibliographies of the history and philosophy of science 



and of the history of civilization. Isis, vol. 4, 124-219, 390-453 (1922). 



. The teaching of the history of science: Second article. Isis, vol. 4, 225-249 (1921). 



Schultz, A. H. The frequency and significance of bregmatic bones in mammals. Jour. Mam- 

 malogy, vol. 3 (1922). 



. Zygodactyly and its inheritance. Jour. Heredity, vol. 13 (1922). 



Seares, Frederick H. The masses and densities of the stars. Astrophys. Jour., vol. 55, 

 165-237 (1922) ; Mt. Wilson Contr., No. 226. 



. Revised magnitudes for stars 'near the North Pole. Astrophys. Jour., vol. 56, 



97-118 (1922); Mt. Wilson Contr., No. 235. 



. The relation of color index to spectrum in the Pleiades. Pubs. A. S. P., vol. 34, 



56-58 (1922). 



, and Milton L. Humason. Further evidence on the brightness of the stars of the North 



Polar Sequence. Astrophys. Jour., vol. 56, 84-96 (1922); Mt. Wilson Contr., No. 234. 

 and others. Report of Commission on Stellar Photometry. Trans. Internat. Astron. 



Union, vol. 1, Rome meeting (1922). 

 Shapley, Harlow, and Beatrice Mayberry. Studies of magnitudes in star clusters, XIII. 



Variable stars in N. G. C. 7006. Proc. Nat. Acad. Sci., vol. 7, 152-154 (1921); Mt. Wilson 



Communications, No. 74. 

 , and Myrtle Richmond. Studies based on the colors and magnitudes in stellar clusters. 



Nineteenth paper: A photometric survey of the Pleiades. Astrophys. Jour., vol. 54, 323- 



333 (1921); Mt. Wilson Contr., No. 218. 



