As to the quantity of the whole Encreafe it can't be 
determin d by any general rule, fince it varies accor- 
ding to the different vS^r^w^^^ of the Oyl of Vitriol for it 
appears by the Table, the more diluted the Liquor, the lejs 
attraHive it prov'd. This here imploy'd ( as highly 
Phlegm^d I pre fume as any ufually is ) gave 2. triple and 
more than i of its firlt weight , amounting in all from 
three to nine Drams, and thirty Grains before it come 
to a Stand. Which, proportion o( Encreafe I found con- 
firmed in lejfer quantitiej alfo ; as, three Grains 
creast to more then nine Grains; and one Grain gave 
the weight of fomething more than three Grains. But 
befidesthefirength of the Liquor j there are other Dr- 
cumjiances^ as the Seafon of the yeaT; and pofition of 
thQplace^ which will certainly fomething alter this point; 
thus our liquor will gain more in Winter than in Sum-^ 
mer I moxQ in a Cellar and Sunlejs Room, than in a 
Room not fo qualtfid. 
All thefe circumftances which relate to the quantity 
will alfo Influence very much the time of the Encreafe, 
the laft: t)iing to be confider'd in the experiment; but 
1 lhalionly mention that which makes the moft pecu- 
liar and principal variation in this point, and tis the 
proportion of the Surface to the bulk^ of the Liquor, For I 
find the gr^ater or lefs the Surface is, the quicker ox (lower 
the Eilcreafe. Thus three Grains dropt and diffus'd 
to nere % Inch breadth on a peice ot Glafs, gain'd 
three Grains in fix hours, one Grain m fix more, one 
Grain and i in twelve hours more, in the next 12 hours 
gained t a Grain, and in the laft twelve hours it gaind 
very little obfervable ; So that in lefs then forty eight 
hours, having more then triple its firft weight, it was for 
{omQtimt fully fatiated till ^iny w^^ii^r added fome- 
thing more. 
But to dilcover more nicely what intreft the propor- 
K tion 
