October 20, 1922] 



SCIENCE 



459 



Chemotherapeutic studies of various aromatic or- 

 ganic arsenicals: George W. Eaiziss and Joseph 

 L. Gavron. The authors have found that in ex- 

 perimental trypanosomiasis due to infection with 

 T. equiperdum complete cures may be effected by 

 employing very pure samples of the two pentava- 

 lent organic arsenicals — p-arsanilic acid and 

 3-amino-4-hydroxyphenylarsonie acid. The ehemo- 



... maximum tolerated dose 



therapeutic indices , which 



minimum curative dose 



are 6.7 and 10, respectively, are of particular in- 

 terest in view of the favoraible results obtained 

 by various French investigators in the treatment 

 of human syphilis with the above arsenicals. 

 Furthermore, by utilizing these compounds as 

 coupling agents the authors have prepared various 

 arsenical dyes and found them to possess but 

 feeble trypanocidal properties. Methods for the 

 preparation of pure p-hydroxyphenylarsine and 

 S-animo-i-hydroxyphenylarsine have also been de- 

 veloped. 



Experimental worTc in the prediction of physio- 

 logical action: Oliver Kamm. Considerations 

 from the standpoint of molecular magnitude are 

 of value in predicting certain toxicity data of 

 mono-hydroxy alcohols. Prom the physiological 

 results obtained mth aliphatic members it was 

 possible to predict corresponding effects of alco- 

 hols of the benzyl type, thus showing that benzyl 

 compounds are devoid of certain specific effects 

 sometimes credited to them. 



Charles L. Parsons, 



Secretary 



THE AMERICAN ASTRONOMICAL. 

 SOCIETY 



Thk twenty-eighth meeting of the society was 

 held at the Yerkes Observatory, Williams Bay, 

 Wisconsin, on September 5 to 8, 1922. This 

 ■ was the twenty-fifth anniversary of the open- 

 ing of the observatory and also of the found- 

 ing of the society, which grew out of the con- 

 ference of astronomers held in connection with 

 the dedication of the observatory in 1897. The 

 members and visitors, who numbered about one 

 hundred, were quartered at the Y. M. C. A. 

 Oamp on the shore of Lake Geneva. 



Sessions for papers extended over three 

 days, and the social events included a recep- 

 tion at the home of Director and Mrs. Frost, 

 a boat ride on Lake Geneva, and the annual 



dinner. On one evening Professor E. E. Bar- 

 nard gave an illustrated lecture on "Some 

 Peculiarities of the Comets," and the anniver- 

 sary celebration included reminiscences of the 

 twenty-five years of the observatory and of the 

 society. A series of astronomical moving pic- 

 tures was also exhibited. 



Nineteen new members were elected to the 

 society, bringing the total membership up to 

 three hundrd and ninety. The society elected 

 to honorary membership Professor H. H. 

 Turner, director of the University Observatory, 

 Oxford, England. 



Officers for the ensuing year are as follows : 



President: W. W. Campbell. 



Vice-presidents: John A. Miller, Henry Norris 

 Eussell. 



Secretary: Joel Stebbins. 



Treasurer: Benjamin Boss. 



Councilors: Philip Fox, Caroline E. Furness, 

 A. O. Leuselmer, John M. Poor, Charles E. St. 

 John, Frank Schlesinger, Frederick Slocum. 



Members of the National Research Council: 

 W. "W. Campbell, Edwin B. Frost, Henry Norris 

 Eussell. 



The next meeting of the society will be held 

 in affiliation with the American Association for 

 the Advancement of Science at Boston and 

 Cambridge in December, 1922. 



The program of papers was as follows: 



A spectroscopic method of deriving the paral- 

 laxes of A-type stars: Walter S. Adams and 

 A. H. Joy. 



Partial explanation, Jiy wave-lengths, of the 

 k-term in the B-types: Sebastian Albrecht. 



Trigonometric parallax of the Pleiades: Har- 

 old li. Alden. 



The variable star, M a, Bailey 33: E. E. Bar- 

 nard. 



Saturn's rings when the earth passed through 

 their plane in 1930-1931 : E. E. Barnard. 



Redetermination of secondary standards of 

 wave-length from the new international iron arc: 

 K-En'iN Burns, C. C. Kiess and W. F. Meggers. 



The orbit of the spectroscopic binary H. R. 

 6532: J. W. Campbell. 



Nova Scorpvi No. 3 (192S) : Annie J. Cannon. 



Measurements of planetary radiation: W. W. 

 Coblentz and C. O. Lampland. 



On the light variations of Beta Lyra: and Delta 

 Cephei: E. H. Curtiss. 



The parallax of Capella from desentitized 

 plates: Zaccheus Daniel. 



