[ 357 ] 
XXXIX. Continuation of an experimental 
Inqiciry concerning the Nature of the 
mineral elaflic Spirit , or Air , contained 
in the Pouhon TV at er, and other Aci - 
dulce. By W. Brownrigg, M. D. F. R . S. 
Addrejfed to Sir John Pringle, Bart. 
F. R. S. 
TO SIR JOHN PRINGLE, BART. F. R. S. 
SIR, 
Redde, April z2, TTOU have often, with others of 
* 774 ’ JL m y friends, been pleafed to in- 
quire after the continuation of my experiments on 
the mineral water of spa, which I promifed to com- 
municate to the Royal Society, with a view to ex- 
plain “ the mode of union that exifts between the 
“ air of thofe waters, and the other principles of 
“ which they are compofed, together with the 
“ relation which that elaflic fluid bears to common 
“ air, and to various other bodies (tf).” Thofe expe- 
(a) See Conclufion to an experimental Inquiry concerning 
the mineral elaflic Spirit, or Air, contained in Spa Water, Stc . 
Philofophical TranAufliens, Vo!. LV. 
rimer, ts 
