260 TRANSACTIONS OF THE [MAY 20, 
following paper, which was referred to the Publication Com- 
mittee. 
T. L. Casey, Coleopterological Notes VI. 
Prof. D. S. Martin read the following note from Mr. George 
F. Kunz, on Phosphorescent Diamonds : 
The luminous properties of gems have been referred to from 
the earliest times. The phosphorescence of the diamond was 
treated at some length by Robert Boyle in 1666 and by Du 
Pay in 1751. Only certain diamonds emit light or phosphoresce 
on exposure for a time to the rays of the sun, or of electric, cal- 
cium or other intense light. The various colors of the diamond 
are evidently due to the presence of hydrocarbons, similar to- 
those which are artificially made in such endless variety and of 
all known colors, and which often fluoresce and phosphoresce. 
After a personal examination of a great number of diamonds, it. 
appears that only certain ones fluoresce on exposure to the ultra- 
violet rays of an electric or other strong light, and from the 
observations made it is very evident that this fluorescence and 
phosphorescence is a property only of those diamonds that con- 
tain a certain bluish-white substance, and it is this substance 
that fluoresces and phosphoresces and not the diamond. This. 
is, undoubtedly, a hydrocarbon, for, as stated above, this prop- 
erty of fluorescence and phosphorescence is marked in many 
hydrocarbons, notably anthracine. I therefore think it would 
not be inappropriate to give this substance a definite name, and 
I propose that of Tiffanyite. GEORGE F. Kunz. 
The following memorial was then presented in -accordance 
with the resolution of April 22, 1895: 
The New York Academy of Sciences has learned with pro- 
found sorrow of the death of Professor James Dwight Dana, of 
Yale University. For over fifty years Professor Dana has been 
one of the central figures in American Science, and his loss. 
leaves a gap that will not soon be filled. Born in 1813, his in- 
clinations were early manifested for those branches of science 
