A P 'P E N D I X. 279 
■the Spirit in the Effcrvcfcence is not per- 
manently elaftic, or elfe that in the Solution of 
fome Stones, it is thrown oiT into a more per- 
manently elaftic State than from others. 
10. And that this Air, which is thus gene- 
rated from folid Bodies by Eftervefcence, is nor 
meet latent interface Air, feems further pro- 
bable from hence, viz, that Tartar which a- 
bounds fo much with Air when diflblvcd With 
Spirit of Nitre in Experiment I. Numb, 4. 
of Experiments on Stones, generated no Air, 
which (hews that certain eflervefeent or fer- 
menting Degrees of Vibration are requifitc, in 
order to throw the Particles of dilTolving 
Bodies into a permanently elaflic State. 
11. There are other Inhanccs in Nature, 
where the fame Particles are fometimes m an 
elaftic,and at other times in a fixed State : Thus 
in the Experiments on Eleflricity, the fame Par- 
ticles of Tinfel, Down, (ire, are when ap- 
proached by a well rubbed glafs Tube, fome- 
times in a repulfive, i, e, elaftic State, and 
fometimes in an attractive and cohering State. 
We may obferve the fame alfo in Water, whofc 
Particles in a hot explofive State are vallly clafi 
tic, but in a frozen State, ftrongly cohering 
and fixed 5 aud why may not Air Particles have 
T 4 ihQ 
