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 . Star clusters and the structure of the universe. Scicntia, vol. 26, 269-276, 353-361 



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'. Notes on the Formicidse of Mount Wilson. Bull. Ecol. Soc. Amer., vol. 3, 229 (1919). 



. Note on pterergates in the California n harvester ant. Psyche, vol. 27,72-74 (Aug. 



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 , and Helen Davis. Studies based on the colors and magnitudes in stellar clusters. 



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 , and Seth B. Nicholson. On the spectral lines of a pulsating star. Proc. Nat. Acad. 



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 Shepherd, E. S. Two gas collections from Mauna Loa. Bull. Hawaiian Volcano Observ., 



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 Sherman, H. C. Protein requirement of maintenance in man. Proc. Nat. Acad. Sci., vol. 6, 



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 Shipley, J. W. See Richards, T. W. 

 Shipley, P. G. The physiological significance of the reaction of tissue cells to vital benzidene 



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 Smith, D. T. Melanin pigment in the pigmented epithelium of the retina of the embryo chick's 



eye, studied in vivo and in vitro. Anat. Rec, vol. 18, 260 (1920). 

 Spaulding, M. H. The early recognition of sex from the external genitalia in human embryos 



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 . The spectroscopic committee of the Division of Physical Sciences of the Research Coun- 

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. The displacement of solar spectral lines. Observatory, vol. 43, 260-262 (1920). 



, and Harold D. Babcock. Concerning tables of solar wave-lengths in the International 



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and Seth B. Nicholson. Relative wave-lengths of sky-light and Venus-reflected sun- 



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 Streeter, G. L. Formation of single ovum twins. Johns Hopkins Hosp. Bull., vol. 30, 235-238 



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. Embryological significance of the crus helicis. Anat. Rec, vol. IS, 263 (1920). 



Stromberg, Gustaf. Note on the relationship of mean parallax to mean proper motion. Mt. 



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 , and J. H. Jeans. Problems of cosmogony and stellar dynamics. Cambridge (1919) 



(a review) ; Pubs. A. S. P., vol. 32, 50-53 (1920). 



. Note on the use of the geometrical mean parallax. Pubs. A. S. P., vol. 32, 244 (1920), 



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Sturtevant, a. H. The vermilion gene and gynandromorphism. Proc. Soc. Exper. Biol, and 

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. Intersexes in Drosophila simulans. Science, n. s., vol. 51, 325-327 (Mar. 26, 1920). 



. The dipterous genus Zygothrica. Proc. U. S. Nat. Mus. (1920). 



. See Morgan, T. H. 



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Swann, W. F. G. Atmospheric electricity. Jour. Franklin Inst., vol. 188, No. 5, 577-606 

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