824 Scientific Intelligence. 
result had been obtained; and, certainly, the circumstances con- 
nected with the synthesis both of indigotine and of alizarine illus- 
troscope has discovered the presence of carbon. It Id seem 
as if the purpose of the address were to bring the molecular theory 
into disrepute by a “reductio ad a dum ;” nnot 
hypothesis” may be m 0 appear if we insist on realizing its 
conventional and temporary forms. No partial truths will bear 
such treatment, and these addresses seem to us worthy 0 
J.P. 0 
; imental determination of the velocity of Light; by 
A. A. Micuetson, U. S. N ., Instructor in Physics and Chemistry 
in the United States Naval Academy.—In a former number of this 
Journal (May, 1878, p. 394) a brief description is given by Mr. 
Michelson of a new method for the experimental determination of 
ance 
between the mirrors, and a correspondingly increased displacement 
sin put 
See an) 
