OP ARTS AND SCIENCES. 509 



Note on the Rate of Debyclnition of Crystallized Salts. By 

 T. W. Richards. 



On the 3, 4, 5 Tribromaniline and some Derivatives of unsym- 

 metrical Tribrombenzol. By C. Loring Jackson and F. B. 

 Gallivan. 



On the Oxide of Dichlormethoxyquinonedibenzoylmethylace- 

 tal. By C. Loring Jackson and H. A. Torrey. 



£ight hundred and ninety-second Meeting. 



June 9, 1897. 



The Academy met at the house of Francis Blake, at Weston. 



The President in the chair. 



The Chair announced the death of Alvan Graham Clark, 

 Benjamin Eddj^ Cotting, and John Lowell, Resident Fellows. 



The Chair read a letter from the Boston Society of Natural 

 History in reference to inviting the American Association fur 

 the Advancement of Science to meet in Boston in 1898. This 

 matter was referred to the executive officers. 



The following papers were read : — 



Certain Considerations concerning the Coinage of the Colony 

 and the Public Bills of Credit of the Province of the Massachu- 

 setts Bay. By A.McFarland Davis, 



Suggestions for the Development of the Arts and Sciences. 

 By William R. Livermore. 



The following papers were presented by title : — 



The Orthopteran Group Scudderi?e. By S. H. Scudder. 



Contributions from the Gray Herbarium of Harvard L^ni- 

 versity. New Series. No. XH. — By M. L. Fernald. I. A Sys- 

 tematic Study of the United States and Mexican Species of Pectis. 

 H. Some rare and undescribed Plants collected by Dr. Edward 

 Palmer at Acapulco, Mexico. Presented by B. L. Robinson. 



A Revision of the Atomic Weight of Cobalt. By T. W. 

 Richards and G. P. Baxter. 



A Revision of the Atomic Weight of Nickel. By T. W. 

 Richards and A. S. Cushman. 



