the Light of Bodies in a Strife of Comm/lion . ' 21 1 
has been very much impaired by long keeping ; when 
finely powdered and placed within the circuit of an electrical 
battery, will exhibit by their fcattered particles a fhower 
of light; but thefe particles will appear reddifll, or their 
phofphoric power will be fufficient only to detain the 
yellow, orange, and red rays. When fpirits of wine are in a 
fimilar manner brought within the circuit of a battery, a 
fimilar effebt may be difeovered ; its particles diverge in feveral 
directions, difplaying a molt beautiful golden appearance. The 
metallic calces are, of all bodies, thofe which are rendered 
phofphoric with the greateft difficulty. But even thefe may 
be fcattered into a lhower of red luminous particles by the 
elebtric ftroke. 
Norwich, Oct. 7, 1784. 
n «>— t 1 it r 
POSTSCRIPT by the Rev* Df. Price. 
BY the phofphoric force mentioned in the laft paragraph of 
this paper, Mr. Morgan appears to mean, not the force with 
which a phofphoric body emits , but the force with which it 
abforbs and retains light. This laft force is proportioned 
to the degree of attraction between the phofphoric body and 
light ; and therefore muft (as Mr. Morgan obferves) be 
weakef when it emits fo freely the light it has imbibed as not 
to retain thofe rays which adhere to it moft ftrongly. Ac- 
cording to Mr, Morgan’s theory, thefe rays are thofe which 
E e 2 arc. 
