312 PROCEEDINGS OF THE AMERICAN ACADEMY 



Crawford Howell Toy, of Cambridge, to be a Resident 

 Fellow in Class III., Section 2. 



On the recommendation of the Rumford Committee, it 

 was 



Voted, To appropriate two hundred and fifty dollars ($250) 

 from the income of the Rumford Fund to assist Professor 

 Trowbridge in his work on metallic spectra. 



The following papers were presented : — 



" Historical Study at Babylon in the Sixth Century B. C." 

 By David G. Lyon. 



" An Instrument for determining the Direction and Ve- 

 locity of Water Currents below the Surface." By Edward 

 S. Ritchie. 



The following papers were presented by title : — 



" On Sulphopyromucic Acids." By Henry B. Hill and 

 Arthur W. Palmer. 



" Notes upon some Polypetalous Genera and Orders." By 

 Asa Gray. 



" Contributions to American Botany : — I. Some New Spe- 

 cies of Plants of the United States. II. Some New Species 

 of Mexican Plants, chiefly of Mr. C. G. Pringle's Collection 

 in the Mountains of Chihuahua, in 1887. III. Description 

 of some Plants of Guatemala." By Sereno Watson. 



Mr. Sereno Watson exhibited and described a specimen of 

 wild corn found in the mountains south of Guanaxuato in 

 Mexico. 



Eight hundred and eleventh Meeting. 



April 11, 1888. — Monthly Meeting. 



The President in the chair. 



The following papers were presented : — 



" The Proper Shape for Armature Cores in Dynamo-elec- 

 tric Machines." By William L. Hooper. 



" Results of the Comparison of a Number of British Asso- 

 ciation Standards of the Units of Electrical Resistance." By 

 William L. Hooper. 



