E9I2] 
Chymift in Europe, if he can find out any body, that by 
a fair Chymical examen, does not contain Calidum ^fri^ 
gtdum.tyiCQ^t the true oyl of Vitriol,which ('as we have al- 
ready faid,)has only fo much frigidum^ as it contains Hu^ 
midum ox common. yff2Lttv, which is fo far overbailanced 
by the ^cidum,t\i2it we can difcern no Frigidum at all. In 
this Menftmum all metals can be diflblved, excepting 
gold,which requires Tifrigidum^to be joined with diCalidum. 
Thele terms of Acidum^ Vrinojum, and Alkali, have 
*lo much confounded all men, that it has moved me, to 
write particularly, and copioufly of them,^>2 Labor atorio 
rneo Experimentalt*But in ftiort,! find all Acida^ excepting 
Oleum Vitriolic to confift of Salia compojita.mi^t with a Sal 
Frigidum. Alkali {alts,are all much the fame, if clean and 
pure,and nothing elfe but Saha Acida cumfrigidis^zxidi are 
much a kin to common fealalt, when that is difpirited. 
The ^^^y^j',ifyou fix them b/ a mixture of Earth, be- 
come Alkali falts. But in cafe you joyn pure oyl of Vi- 
triol with fuch an Earth, as Cornu Cervi calcinatum, which 
carry's in it no more of an Acidum, or of an Vrinofumy 
this will not yet agree with other Alkalys, unlefs you give 
it a fupply of an Vrinojum, 
Saliafrfgida if pure, are all homogeneous, let them h€ 
made of what Vegetables, or Animals loever; from 
whence I infer , that nature only makes ufe of thefe two 
principal parts : whichfiace I came to underftand it, has 
cxcufed me from many a troublefome work or operation, 
and would alio much leflen the proceiTes of many, and 
lighten their labours, did they but know tke true pro- 
perty of thofe bodys they work upon. 
Since now I fuppofe my felf, to have layd this firm 
Foundation, I will only hint at two or three well known 
materials, out of which heat, and Lightning may be 
brought, in which no Oleum can be demonftrated to have 
been contained. This ! needed not to have done, be- 
caufe, you have made more Experiments your felves of 
this nature: I only do it with regard to the Oleijli ^ who 
would 
