February 11, 1916] 



SCIENCE 



211 



odd forms referred to Tricliotropis. A new 

 species of Neoeoncha has a strong resemblance 

 to Torellia. Modiolaria lateralis Say, orig- 

 inally described from tbe Florida coast, was 

 obtained from South Trinidad Island, 700 

 miles off the coast of Brazil in the South 

 Atlantic. 



Wm. H. Dall 



PROCEEDINGS OF THE NATIONAL 

 ACADEMY OF SCIENCES 



(Volume 2, JSTumber 1) 

 The first number of volume 2 of the Pro- 

 ceedings of the National Academy of Sci- 

 ences contains the following articles: 



1. A Possible Origin for Some Spiral Neb- 

 ulae: G. F. Becker, United States Geolog- 

 ical Survey, Washington. 



It is suggested that nebulae may be devel- 

 oped from nebulous streamers or " bacula." 

 Comparison of the theoretical shape of the 

 nebulae at certain stages of their development 

 with the Whirlpool nebula is not unfavorable 

 to the hypothesis. 



2. A Peculiar Clay from near the City of 

 Mexico : E. W. Hilgard, University of Cali- 

 fornia. 



The analysis shows that the predominant 

 base is magnesia. A peculiarity of the clay 

 is its exceptionally high absorptive power for 

 water. 



3. Studies of Magnitude in Star Clusters, 



I. On the Absorption of Light in Space: 

 Harlow Shapley, Mount Wilson Solar 

 Observatory, Carnegie Institution of Wash- 

 ington. 



The examination of the Hercules cluster 

 indicates the conclusion that the selective ex- 

 tinction of light in space is entirely inap- 

 preciable and that probably the non-selective 

 absorption in space is also negligible. 



4. Studies of Magnitudes in Star Clusters, 



II. On the Sequence of Spectral Types In 

 Stellar Evolution : Harlow Shapley, Mount 

 Wilson Solar Observatory, Carnegie Insti- 

 tution of Washington. 



The giant second-type stars are present in 

 large numbers in the globular clusters. The 



results offer difficulties for the conventional 

 scheme of evolution of spectral types, but the 

 difficulties are not so severe for Russell's 

 h3Tpothesis. 



5. Experimental Evidence for the Essential 

 Identity of the Selective and Normal Photo- 

 Electric Effects : E. A. Millikan and W. H. 

 Souder, Eyerson Physical Laboratory, Uni- 

 versity of Chicago. 



Photo-electric phenomena are not in gen- 

 eral conditioned by the presence of a gas. All 

 distinctions between the normal and selective 

 effects in lithium have disappeared. 



6. Concomitant Changes in Terrestrial Mag- 

 netism, and Solar Radiation: L. A. Bauer, 

 Department of Terrestrial Magnetism, Car- 

 negie Institution of Washington. 

 Changes in the earth's magnetism of appre- 

 ciable amount are found associated with 

 changes in solar radiation. Decreased solar 

 constant is accompanied by increased magnetic 

 constant. Various minor but important corre- 

 lations are established. 



7. Submarine Solution of Limestone in Rela- 

 tion to the Murray-Agassiz Theory of Coral 

 Atolls: A. G. Mayer, Department of Marine 

 Biology, Carnegie Institution of Washing- 

 ton. 



By exposing pieces of shell of the mollusc 

 Cassis to solution in sea-water for a year under 

 various conditions, it is shown that the rate of 

 solution is too slow to be favorable to the 

 theory that the solvent action of sea-water for 

 limestone is a primary factor in deepening and 

 widening the lagoons of coral atolls. 



8. The Archegonium and Sporophyte of Treu- 

 bia Insignis Goebel: D. H. Campbell, De- 

 partment of Botany, Stanford University. 

 Treubia is probably on the whole nearer the 



leafy liverworts than is any other anacrogyn- 

 ous genus. 



9. Brief Notes on Recent Anthropological Ex- 

 plorations under the Auspices of the Smith- 

 sonian Institution and the U. S. National 

 Museum: Ales Hedlicka, Division of Phys- 

 ical Anthropology, U. S. !N"ational Museum. 

 The topics treated are : Search for Neolithic 



Human Eemains in Southwestern Eussia; 



