C 7<S ] 
As to what relates to the Oil of Lime *, of which 
I have fpoken in my Experiments, it is the Caput 
Mortuum of the Sal Ammoniac , after Diftillation of 
the volatile Spirit by the means of Quick-lime ; it is 
expofed in a flat Veflel to the Moiflure of the Cellar, 
whence a ' TDeliquiiim is formed, which we call Oil 
of Lime. It is Lime dilfolved by the means of the 
Acid of the Sea-fa!t, which is contained in the Sal Am- 
moniac ; other Chymifts call it the fixed Liquor of 
Sal Ammoniac. Your Soap-boilers are obliged to 
add Sca-falt to their Soap, which I believe, for my 
part, comes from their making ufe ofPot-afh in their 
Lyes, which they would have no occafion to have 
recourfe to, if they employed true Salt of Glafs-wort, 
feeing my ftrong Lye of Salt of Glafs-wort makes 
Soap immediately ; befides, the Salt of Glafs-wort 
contains Sea falt, which I have demonflrated by 
making Salt of Glauber with pure Salt of Glafs-wort 
and Oil of Vitriol : If inftcad of Salt of Glafs-wort 
one makes ufe of Pot-afh with Oil of Vitriol, it will 
not make Salt of Glauber , but inftead of it produce 
Tartar vitriolate. 
In deferibing this fort of Soap, I had no other 
View, than not to deviate from the way of 
making Alicant Soapy and to know well the Propor- 
tions, in order to apply them to the making of the 
Soap I propofe, and to fix them with regard to the 
Lime and the Salt of Glafs-wort, which for many and 
various Pveafons is preferable to other fixed Salts, as 
being that which forms the bell, the moft deterfive. 
* Huile de Chaux. 
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