imbibes as greedily, as aSlual fire does the pabulum ot Ni- 
tre, yet we muft allow that all the other Circumjlances 
of Seafon juft now mentioned have each their parti- 
cular influences in diverfifying the quantity of the In- 
creafe. Thus it appears in thdTable that heat alters the pro- 
gre/s of increafing : For on the fourteenth day of 
November from ii mat. to ii pom, ( at which time 
fpecially towards night ) a very unufual and troublefome 
heat in the Air was complain d of by feveral here in Ox- 
ford ) in twelve hours the gain was only three Grains 
andf, whereas in the like time preceeding 'twas lo 
Grains and f, and in that juft following 9 Grains. 
Neither indeed can any thing otherwife be expected 
from Heat, fince thereby the Moifiure might rather be 
exhal'di or at leaft might be fufpended, agitated and in- 
timately with the (ubftance of the Air, and confe- 
quently not fo eafily be Arrefied and Entangled hy the 
iurface of the Liquor, as when the Air is lefs hot. How 
ever allowing the effect: of this anomalous accident at a 
time of the year when /^^^/? expeded, and confidering 
that moft commonly //-p^i^ keeps even pace with the Sea- 
fono£ the year, depending as to its temper for the moft 
part on the Neamefs or J^motenefs of the Sun i we may 
lafely conclude Moifiure the cheif and only caufe of the 
Increafe of Weight in Oyl of Vitriol^ fince in Dry, Clear 
Weather it conftantly increafes lefs then in Moifi and 
Cloudy, the circumftance of Heat or Cold remaining the 
fame in both. 
But thiswill be clearly evinced by an enquiry made into 
the nature of the fuhftance gaind^ with the Increafe of 
Weight. For by the prdiiaary wayesof tryal itappcard 
the Atmofphere afforded our liquor nothing befides fome 
of its watry particles, wherewith it alv/ays abounds, but 
more efpecially is ready to part with in Moijl weather. 
The^i?> without doubt has great variety of dijferetit 
Subjiances floating in it, whereof /ow^ particles do ad^ 
here 
