mo UT Gaffield on the action of Sunlight on Glass. 
dark corner in which I placed my specimens. F 
It may be, that the action of the sun’s heat produced the 
changed to a yellow color b exposure for a year, may by ane 
longer exposure be turned toa yellowish pink and a poe 
And some which have been entirely unaffected, may be 
h 
of white 
es froma white to a yellowish color, we 
a bluish 
ae 
