568 



SCIENCE 



[N. S. Vol. XLVI. No. 1197 



York. Three principal axes are determined 

 along which the various groups of stars show 

 markedly unequal motion. 



The eighth numher of Volume 3 of the Pro- 

 ceedings of the National Academy of Sciences 

 contains the following articles: 



Relation of Preferential Motion and of the 

 Spectral-Class and Magnitude Velocity Pro- 

 gressions to Proper Motion: C. D. Perrine, 

 Observatorio ISTacional Argentine, Cordoba. 



Growth of Isolated Sporophytes of Antho- 

 ceros: Douglas Houghton Campbell, depart- 

 ment of botany, Leland Stanford University. 

 The young sporophyte of Anthoceros Pear- 

 soni, separated from its association with the 

 gametophyte, is capable of limited growth in 

 length and is able to mature normal spores 

 and elaters from the young sporogenous tissue. 



The Mesa Verde Types of Puehlos: J. 

 Walter Fewkes, Bureau of American Ethnol- 

 ogy, Washington, D. C. A morphological 

 study of Far View House and other types of 

 prehistoric buildings. 



A Determination of the Ratio of the Spe- 

 cific Heats of Hydrogen at 18° and — 190° C. : 

 Margaret C. Shields, Eyerson Physical Lab- 

 oratory, University of Chicago. The value 

 1.4012 closely in accord with kinetic theory 

 and different from previous determinations at 

 18° C. is obtained; the value 1.592 is found at 

 — 190° C. 



Note on the Coefficient of Total Radiation of 

 a Uniformly Heated Enclosure: W. W. Cob- 

 lentz, Bureau of Standards, Washington, D. C. 

 The value 5.722X10"" is found by direct 

 measurement and agrees with that calculated 

 by Millikan on the basis of his values for h 

 and e. 



The Development of a Source for Standard 

 Wave-Lengths and the Importance of their 

 Fundamental Values: Charles E. St. John 

 and Harold D. Babcock, Mount Wilson Solar 

 Observatory, Carnegie Institution of Wash- 

 ington. It is necessary to examine for pole 

 effect; the problem of wave-length determina- 

 tion is not one of routine but one for real in- 

 vestigation. 



On the Presence of Albumoses in Extracts 

 of the Posterior Lohe of the Hypophysis 



Cerebri: John J. Abel and M. C. Pincoffs, 

 Pharmacological Laboratory, Johns Hopkins 

 University. Secondary albumoses and pos- 

 sibly peptones were found to be present in all 

 the therapeutically used extracts of the pos- 

 terior lobe of the hypophysis cerebri that were 

 examined. The " Hypophysin " of the Parb- 

 werke-Hoechst is not, as claimed for it, a solu- 

 tion of the isolated active substances of the 

 pituitary gland but a mixture of albumoses 

 with varying and unknown amounts of active 

 and inactive constituents of the gland. 



On the Role of the Thymus in the Produc- 

 tion of Tetany: Eduard Uhlenhuth, Rocke- 

 feller Institute of Medical Eesearch, Ifew 

 York. It would seem that thymus contains the 

 substances which cause tetany and secretes 

 them into the body from which they are re- 

 moved by the parathyroids. Extirpation of 

 the latter would thus cause tetany. 



Evidence of Assortive Mating in a Nudi- 

 hranch: W. J. Crozier, Bermuda Biological 

 Station for Eesearch, Agar's Island, Bermuda. 

 Mating pairs of the nudibranch Ohromodoris 

 zeira are found to exhibit a rather high de- 

 gree of correlation between the sizes of the two 

 members. This is due to assortive mating, 

 which may constitute an important influence 

 tending to increase the numbers of larvae. 



Coral Reefs of Tutuila, with Reference to the 

 Murray -Agassiz Solution Theory: Alfred 

 Goldsborough Mayer, Department of Marine 

 Biology, Carnegie Institution of Washington. 



National Research Council: Suggestions re- 

 lating to the new National Army by the 

 Anthropology Committee of the National Ee- 

 search Council; First Eeport of Committee on 

 Botany; Meetings of the Executive Committee. 



Notices of Biographical Memoirs. 



Edwin Bidwell Wilson 



Massachusetts Institute of Technology, 

 Cambridge, Mass. 



SPECIAL ARTICLES 



A RELATION OF ATOMIC WEIGHTS TO ATOMIC 



NUMBERS, AND A SUGGESTED STRUCTURE 



OF ATOMIC NUCLEI 



The writer has plotted, for all the elements, 

 ratios of atomic numbers to the corresponding 



