( 9°4 ) 
Experiment, the one from a dark opake Colour to a 
noble Scarlet Dye ; the other from a pale or colourlefs 
Liquor to a rich Vltra Marine Blue, do all combine to 
do juftice to the Air for this celebrated alteration. Nor 
is the Air thusinfus'd into the Lungs for a bare Colour, 
and of no farther confideration: But I am apt to believe 
the great Fermentations of the Blood the caufe of the 
Motions and Actions of the Mufcles ; the Animal Spi- 
rits themfelves, the great Spring of Motions, derive their 
Energy and Powers, if not Nature, from hence. 
Corollary I. 
The Air is full of Volatile Salts none will deny, but 
that thefe Salts muft bear the name of Nitrous Salts, it 
has been fcarce caird in queftion, which this Experiment 
and fome others I have made, do. Nitrous Salts feem 
to me not to have any property of Volatile Salt : Nitre 
is a Salt of fo fixed a nature, that it will continue melt- 
ed in a very ftrong Fire with fcarce any Evaporation ; 
but if you put into it Charcoal, or Brimftone, or give it 
an Aceenfion by another Eucheirefis you may obtain a 
great quantity of as fixed a Salt as any Concrete what- 
ever affords ; fo that to me Gold feems not of a more 
fix'd Nature. 
CO R O L L A R Y II. 
Aftandard of Volatile Salts ftiould be fetled, atpreftnt 
I can think of none better than Water. That Salt 
which in Diftillation is more fix'd than Water, ought 
not to be reckon'd amongft Volatile Salts : This ftand- 
ard willbejuftifiedby good meafures, grounded on Ex- 
perience ; for all Salts that are truly Volatile, as far as 
I could obferve, are really lighter than Water, that is in 
a Chymical fenfe, do with a lefs degree of Fire fublime 
