~ 
On the Production of Light by Chemical Action. 159 
resources for their primary materials, he derived from these 
sources the elements of a beautiful memoir, both geological and 
chemical, upon the kaolins (porcelain clays) which has been pub- 
lished in more recent years. Faithful to his first researches upon 
the art of enameling, he caused to be revived at Sevres the nearly 
lost art of painting upon glass, the beautiful productions of which 
we have all admired.* 
M. Brongniart, at the age of nineteen, was one of the founders 
of the Philomathic Society—a society equally scientific and mod- 
est, having for its motto, Science and Friendship ; which has pro- 
ved to be the centre of so many useful communications, and which 
at the epoch of the suppression of all the higher institutions, was 
able to hold on its course always illumined by the sacred fire of 
science 
Arr. XVIII.—On the Production of Light by Chemical Action ; 
by Joun Wittram Drarer, M.D., Professor of Chemistry in 
the University of New York. (Communicated by the author. ) 
THE production of light and heat by the combustion of vari- 
ous bodies, is of all chemical processes, that which ministers most 
to the comfort and well-being of man. By it the rigor of winter 
- moderated, and night made almost as available for our use as 
the day. 
* M. Brongniart in 1844, published his splendid work on Pottery or “ Sag ce- 
‘ ” * lg zi 4 t ‘erami: ou es P. tt L ans 
Fee eae atitied, Toad dea hens es in two vols. 8vo, with an Atlas of 
60 plates. We hide alluded to his labors in this department, on page 142 of this 
