214 Mr. P. Henry on the Adlion of 
22. Two ounces of Sperma Ceti oil, and one 
drachm of the earth of Alum, precipitated from ‘a 
folution of Alum, by the vegetable fixed alcali, 
were placed in a fand heat from 180° to 1g0° 
of Farenheit, and fuffered to remain there during 
three hours. ‘The oil became clear and colourlefs, 
the gluten having precipitated with the earth to the 
bottom of the veffel. 
23. Two ounces of linfeed oil and one Jedd 
and a half of pure clay were fubjected to the fame 
degree of heat as the Sperma Ceti oil. This oil 
likewile, became very clear, and much lefs coloured. 
A confiderable depofition of mucilage was obferved 
upon the furface of the clay. The combination of 
the mucilage with the linfeed oil appeared to be 
much ftronger, than that of the Sperma Ceti oil 
with its gluten. 
24. ‘Train oil was likewife rendeved much purer 
by .digeftion with the fame earth, but was in no 
degree equal either to the Sperma Ceti, or linfeed oils. 
_ 25. Both aérated and pure Magnefia piecipitated 
the mucilage, whilft the oils continued warm; but 
as they cooled, the mucilage and magnefia rofe and 
mixed again with the oils. 
26. ‘Ten grains of pure calcareous si being 
added to one ounce of each of the oils, in the 
cold, turned them thick, and dark coloured. 
27. Aérated calcareous earth had little effe& upon 
the oils, either heated or cold. 
In 
