JMl 



PROCEEDINGS 



OF THE 



AMERICAN PHILOSOPHICAL SOCIETY 



HELD AT PHILADELPHIA 

 FOR PROMOTING USEFUL KNOWLEDGE 



Vql. XLIII. April, 1904. No. 176. 



CONTENTS. 



PAGE 



General Mt e' ing, April 7, S and 9 97 



The Role of Carbon. By At.bkrt B. Prescott 102 



Dimeth3'l Racemic Acid: Its Syiiihosis and Derivatives. By 



H \RRY F. Kf.t.ler and Philip Maas 105 



Trisulphoxyarsemc Acid. By Lkroy W^ McCay 113 



Sources of Error in the Determination of the Atomic Weight of 



Nitrogen. By Thkodorb William Richards.... 116 



The Atomic Weight of Tungsten. By Edgar F, Smith ard Franz 



F, ExNKR 123 



The Ripening of Thcur'hts in Common. By Otis T. Mason 148 



Recent. Advances in Oiii- Knowledge of the Evolution ot the Horse. 



By Hknry F. OSP.ORN 156 



Ra'linm in an American Ore. By Alexander H. Phillips 157 



On the Occurrence of Artifacts Beneath a Deposit of Clay. By 



Dr. Charlrs Co nRad Abbott 161 



One Explanation of Repi-ned Showers of Toads. By Dr. Charles 



Conrad Abbott 163 



Expansions of Ali'ebraic Functions at Singular Points. By Pres- 

 ton A. Lambert. ;..... , 164 



The Hamites and Semitps in the Tenth Chapter of Genesis. By 



Morris Jastrow, Jr 173 



Regulation of Colr)r->ig)'als in Marine and Naval Service. By 



Charles A. Olvver 207 



The Arrangement of Collections of Meteorites (with*^ Pt » o-). By 



Aristtdes Bpezina, Vienna 211 



A System of Passeiiger Car Ventilation. By CiiA>.. B. Didlkt, 



Ph.D 247 



philadelphia : 



The American Philosophical Society, 



104 South Fifth Street. 



1904. 



