OP ARTS AND SCIENCES. 507 



On some Properties of Phenyl-siilphone-acetic Ether. By 

 Arthur Michael and G. M. Pahner. 



On Isometric Asparginic Acids. By Arthur Michael and 

 J. F. Wing. 



The Synthesis of Methyl-arbutin and Analogous Glucos- 

 ides. By Arthur Michael. 



On Pyromucic Acid. By Henry B. Hill. 



On the Reduction of Camphor to Borneol. By C. Loring 

 Jackson. 



Descriptions of New Species of Cambarus ; to which is 

 added a Synonymical List of the known Species of Cam- 

 barus and Astacus. By Walter Faxon. (By title.) 



Professor Cooke described and exhibited some remarkable 

 twin crystals of Zircon. 



Seven hundred and seventy-seventh Meeting. 



December 10, 1884. — Monthly Meeting. 



The PRESIDENT in the chair. 



The Corresponding Secretary read the following letters : 

 from the Chairman of the Committee of the Institute of 

 Mines at Saint Petersburg, informing the Academy that he 

 had sent copies of Bulletins, and requesting an exchange of 

 publications ; from the Royal Bohemian Society of Sciences, 

 at Prague, inviting the Academy to send delegates to its 

 centennial festival; from the Society of Naturalists, at Bam- 

 berg, inviting members to attend its semi-centennial festival ; 

 from L. Cruls, announcing his appointment as Director of 

 the Imperial Observatory at Rio Janeiro. 



The following papers were presented by title : — 



Contributions to the Botany of North America. By Asa 

 Gray. 



Dictyoneura and the allied Insects of the Carboniferous 

 Epoch. By Samuel H. Scudder. 



On the Taconian System of Stratified Rocks. By Jules 

 Marcou. 



