Mr. P. Henry on the A@ion of, &'c. 209 
‘So far upon the fubjec&t of the comparative va- 
rieties and abufes of our Alphabetic Characters ; 
but, fo far, within a much more contracted com= 
pafs than the extent and importance of. inquiry 
{till allows: yet as an attention to this Society urged 
the contribution of fome paper to the common 
ftock, fo now feveral confiderations exact the con- 
clufion of this Fragment. 
On the Action of Meratiic Oxyprs and Eartus 
upon Orts, in low Degrees of Heat. By Mr. 
Prerer Henry. Communicated by Mr. ‘Tuomas 
Henry, F. R. S. &c. 
[ReaD nov. 16, 1792.]- 
pH high degree of colour, poffeffed by many 
of the expe and fatty Oils, rendering 
them unfit for feveral ufes in the Arts; it appeared 
to be a defirable object to difcover a mode of de- 
priving them of their colouring particles. 
For this purpofe the following Experiments were 
inftituted. 
Dd 1. Two 
