122 



SCIENCE 



[N. S. Vol. XhYll. No. 1205 



somes are known to be finely drawn out 

 threads, not in the early oogonial divisions 

 nor in the late thick thread stage. 



Genetic Factors affecting the Strength of 

 Linkage in Drosophila: A. H. Sturtevant, 

 Zoological Laboratory, Columbia University. 



Further Evidence on the Concentration of 

 the Stars toward the Galaxy: Frederick H. 

 Seares, Mount Wilson Solar Observatory, 

 Carnegie Institution of Washington. 



Theoretical Relations in the Interferometry 

 of Small Angles: Carl Barus, Departm.ent of 

 Physics, Brown University. 



Inter-Periodic Correlation in the Egg Pro- 

 duction of the Domestic Fowl: J. Arthur 

 Harris, A. F. Blakeslee, and Wm. F. Kirk- 

 patrick. Station for Experimental Evolution, 

 Cold Spring Harbor, N". T., and Connecticut 

 Agricultural College, Storrs, Conn. The re- 

 sults make possible the selection of groups of 

 birds of high annual egg production from the 

 trap nest records of individual months. 



Two Laws governing the Ionization of 

 Strong Electrolytes in Dilute Solutions and 

 a New Rule for Determining Equivalent 

 Conductance at Infinite Dilution Derived from 

 Conductivity Measurements with Extremely 

 diluted Solutions of Potassium Chloride: Ed- 

 ward W. Washburn, Department of Chemistry, 

 University of Illinois. In sufficiently dilute 

 solution all uni-univalent salts of strong 

 acids and bases obey the Mass-Action Law 

 and all have the same ionization constant; 

 the values of the mass-action expression for 

 all such salts are identical, the identity per- 

 sisting up to higher concentrations the more 

 nearly the salts resemble each other. 



On the Growth and Fecundity of Alco- 

 holized Bats: E. C. MacDowell and E. M. 

 Vicari, Station for Experimental Evolution, 

 Cold Spring Harbor, IST. Y. Both growth and 

 the fecundity of the alcoholized is subnormal 

 as compared with non-alcoholics. 



National Research Council: Minutes of the 

 Meeting of the l^ational Eesearch Council 

 held on Thursday, April 19, 1917, in Rooms 

 42 and 43 of the United States Wational Mu- 

 seum, Washington, D. C; Meetings of the 

 Executive Committee. 



The tenth number of Volume 3 of the 

 Proceedings of the National Academy of Sci- 

 ences contains the following articles : 



On the General Theory of Curved Surface 

 and Rectilinear Congruences: Gabriel M. 

 Green, Department of Mathematics, Harvard 

 University. Preliminary announcement of the 

 number of theorems in a field which seems to 

 be promising. 



A Contribution to the Petrography of 

 Southern Celehes: J. P. Iddings and E. W. 

 Morley, Brinklow, Maryland and West Hart- 

 ford, Conn. Twelve analyses of lavas from 

 Celebes. 



On the N on-Existence of Nervous Shell- 

 shoch in Fishes and Marine Invertebrates: 

 Alfred Goldsborough Mayer, Department of 

 Marine Biology, Carnegie Institution of 

 Washington. Corroboration of the conclusion 

 that war shock is predominantly a psychic 

 phenomenon and being hysteria can be cured 

 by hypnotic suggestion. 



Chemical Differentiation of the Central 

 Nervous System in Invertebrates: A. E. 

 Moore, Rutgers College, 'New Brunswick, New 

 Jersey. In the cephalopod, caffein brings 

 about hyperirritability of the cerebral ganglia, 

 while camphor affects the stellar ganglia in 

 the same sense. Atropin causes spasms in 

 the squid, but inhibits the activity of the 

 chromatophores. Camphor shows a selective 

 action in the shrimp paralyzing the elements 

 controlling backward swimming and exciting 

 those controlling forward motion. 



Proof of the Muscle Tension Theory of 

 Heliotropism: Walter E. Garrey, Physiological 

 Laboratory of Tulane University, and Marine 

 Biological Laboratory, Woods Hole. Experi- 

 ments show that the motion of animals to or 

 from a source of light are due to an influence 

 of the light on the tension of muscles of 

 different sides of the body. 



Changeable Coloration in Brachyura: W. 

 H. Longley, Goucher College, Baltimore, and 

 Department of Marine Biology, Carnegie In- 

 stitution of Washington. The colors of crabs 

 and their capacity to change them vary from 

 species to species according to the same gen- 

 eral rule that appears to prevail among fishes. 



