422 Dr. Hulme's Experiments and Observations 
influx of fresh air. The experiment was repeated, and with the 
same result. 
SECTION XII. 
Experiments and Observations on solar Light , when imbibed by 
Canton's Phosphorus. 
§ i. 
The Effects of Heat on imbibed solar Light. 
I. The imbibed Light is rendered more vivid by a moderate 
Degree of Heat. 
EXPERIMENTS. 
Exper. 1. Having prepared some Canton’s phosphorus, and 
exposed it to the light of the sun, it was carried into the dark 
laboratory, to separate the illuminated parts from those that 
remained dark. In doing which, some luminous fragments were 
placed upon the palm of the hand, and retained there for some 
time, when it was observed, that the warmth of the hand con- 
siderably increased the degree of light. 
Exper. 2. Some fragments of this illuminated phosphorus 
were put into a small phial, which was then closed with a cork, 
and suspended, by a string, in a quart of water heated to about 
126°; by these means, the light was rendered much more vivid 
than before. 
Exper. 3. Some other pieces of the illuminated phosphorus 
were dropped separately into a glass tube 32 inches long, and 
-H bore, filled with water at about 120°. The light of each 
piece became exceedingly bright, as soon as it entered the hot 
