468 Count Rumford's Inquiry, &c. 
was, however, a very remarkable difference in the hues of the 
two phials ; that of the phial C being of a light greenish-blue ; 
while that in the phial D was indigo, and of so deep a tint, that 
it might easily have been taken for black. 
These appearances were certainly very striking, and well 
calculated to excite my curiosity ; but I am so much engaged 
in public business, that it is not at present in my power to pur- 
sue these inquiries farther. I wish that what I have done may 
induce others, who have more time to spare, to devote some 
portion of their leisure to these interesting investigations. 
