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SCIENCE 



[N. S. Vol. XLIX, No. 1264 



and of gastropods are essentially concerned in 

 creeping locomotion. 



The Phylogeny of the Acorn Barnacles: 

 Eudolf Euedemann, State Museum, Albany, 

 'N. T. The derivation of an Eohalanus from 

 a Bhinocaris-like phyllopod is illustrated in a 

 set of diagrams. 



Possible Derivation of the Lepadid Barnacles 

 from the Phyllopods: John M. Clarke, State 

 Museum, Albany, 'N. Y. So far as present 

 knowledge exitends, the metamorphoses of the 

 phyllopods into the two great branches of the 

 barnacles were essentially contemporaneous. 



Refractive Index and Solubilities of the Ni- 

 trates of Lead Isotopes : Theodore W. Richards 

 and Walter C. Schumb, Wolcott Gibbs Memo- 

 rial Laboratory, Harvard University. The dif- 

 ference in atomic weight of the lead (207.20 

 and 206.41) has no appreciable effect on the 

 refractive index or on the molal solubility of 

 the diiferent samples of lead nitrate. 



The Purification by Sublimation and the 

 Analysis of Gallium Chloride: Theodore W. 

 Richards, W. M. Craig and J. Sameshima. 

 Wolcott Gibbs Memorial Laiboratory, Harvard 

 University. The method rests on the fact that 

 gallium trichloride sublimes and distils at a 

 low temperature, whereas the other (ihlorides 

 Hkely to be associated with it are much less 

 volatile. 



The Purification of Gallium by Electrolysis, 

 and the Compressibility and Density of Gal- 

 lium: Theodore W. Richard's and Sylvester 

 Boyer, Wolcott Gibbs Memorial Laboratory, 

 Harvard University. The method of separat- 

 ing gallium from indium by means of the dif- 

 ferent solubilities of the hydroxides in caustic 

 alkali was' tested without success ; much more 

 promising results were obtained by the electro- 

 lytic method. The compressibility of solid 

 gallium ■WSL'B found to be 2.09 X 10"", and of 

 liquid gallium 3.97 X 10"°, nearly twice as 

 great, although its volume is less. The density 

 of the liquid was 6.081, and of the solid 5.885. 



The Growth-rate of Samoan Coral Beefs: 

 AKred G. Mayor, Department of Marine Bi- 

 ology, Carnegie Institution of Washington. 

 the growth rate of Acropora, Porites, Pocil- 

 lopra, Pavona, Psammocora are given ; and the 



weight of limestone added per year to the 

 upper surface of the Aua reef-flat is estimated 

 as 805,000 lbs. Other similar estimates are 

 given. 



The Distances of Six Planetary Nehulm: 

 Adriaan van Maanen, Mt. Wilson Solar Ob- 

 servatory, Carnegie Institution of Washington. 

 The nebula; KG.C. 2392, 6720, 6804, 6905, 

 7008 and 7662 are examined. The parallaxes 

 range from 0."002 to O."021, and the diameters 

 from 10,000 to 1,350 astronomical units. 



National Research Council: Minutes of the 

 Meeting of the Executive Board, July 9, Au- 

 gust 13, September 9 and October 8. 



We may summarize the articles in Volume 

 4 of the Proceedings as follows: Mathematics, 

 9; Astronomy, 11; Physics and Engineering, 

 25; Chemistry, 5; Geology and Paleontology, 

 including Mineralogy and Petrology, 9; Bot- 

 any, 3 (see also Genetics) ; Zoology, includ- 

 ing General Biology, 12 (see also Genetics) ; 

 Genetics, 6; Physiology and Pathology, 10; 

 Anthropology and Psychology, 1 ; a total of 91 

 articles. 



The division of these articles between mem- 

 bers of the Academy and non-members is 39 

 and 52 respectively. 



The list of institutions which have con- 

 tributed three or more articles is as follows: 

 Carnegie Institution, 15, divided as follows: 

 Solar Observatory, 7, Ifutrition Laboratory, 4, 

 Geophysical Laboratory, 1, Marine Biology, 1, 

 Sitation for Experimental Evolution, 1, Tortu- 

 gas Laboratory, 1; Harvard University, 15 

 Brown University, 7 ; University of Illinois, 5 

 Bermuda Biological Station for Research, 4 

 University of California, 4; University of Chi 

 cago, 4; University of Pennsylvania, 4. 



Edavin Bidwell Wilson 



Massachusetts Institute op Technology, 

 Cambridge, Mass. 



SPECIAL ARTICLES 



OPPORTUNITIES FOR CONTACT INFECTION! 



An outstanding feature of the influenza 

 pandemic is the remarkable infectivity of the 

 disease. There is scarcely a commimity in 



1 Published by permission of the Surgeoa-Gen- 

 eral of the Army. 



