r 75 ] 
didilled Rain-water, and filtrate it, I find in it Three 
Grains of coarfe Earth, which cannot penetrate the 
Pores of the Filtre. 
If I ufe it to make Soap of it, 1 take one Part to 
two Parts of the beft Oil : I mix them gently in a 
China Bowl, ftirring them with a. Spathula oi white 
Wood, till both Liquors are come to a Confidence 
of Butter that is churning : This Thickening is much 
fooner done in Winter than in Summer. I keep 
the Veftel in a dry Place, that the Moifiure of the 
Air may not diminifh the Strength of the Lye. The 
Mixture from Day to Day grows to a Body, and when 
it is in the Sun in Summer, and upon the Mantle 
of the Chimney in Winter, the Phlegm evaporating 
fooner, it becomes perfect Soap in Four or Five Days, 
provided the Lye be fufficiently concentrated. It 
will be well however, that during the time the two 
Liquors are binding together, the Mixture be fiirred 
with the Spat hula, that the Water may not be kept in, 
but evaporate the fooner. When the Soap is made, 
it eafily comes out of the Veftel, but it has not yet loft 
all that Moifture it fhould lofe ; fo that though one 
may ufe it in that State, yet it is better to keep it 
Twelve or Fifteen Days longer ; at the End of which 
Time if I decompound it, I always find the whole 
Oil I have employed 5 that is to fay, out of Eighteen 
Drachms of this perfedt Soap, I get one Ounce and an 
half of Oil, and Two Drachms Twenty-three or 
Twenty-four Grains of Salt of Glafs-wort. So after 
this Method a Patient may eafily make his own Soap, 
and be fure of the Ingredients ; perhaps even in the 
great Manufafturics, one Day or other, they may pre- 
fer this to that which is now in Ufe. 
K a 
As 
