210. Mr. P. Henry on the Aétion of 
1.. Two ounces of Sperma Ceti Oil were di- 
gelted, with one drachm of white arfenic, in a heat 
of 180° of Farenheit, during fix hours; and left 
to fiand till morning. » The oil was then perfectly 
clear, and colourlefs, and much heavier than it was 
previoufly to the experiment. A great part of the 
arfenic, however, remained undiffolved, at “the 
bottom of the digefting veffel. 
2. ‘Two ounces of Linfeed Oil were digefted 
with one’drachm of white arfenic, under the fame 
circumftances with the former. In the morning 
very little-alteration being perceived in the mixture, 
it was expofed to a fomewhat greater heat. In two 
hours the oil appeared brighter, and clearer, 
much of the arfenic being diffolved; but it yet 
retained a great part of its original colour. ‘There 
was a confiderable depofition of mucilage; the 
arfenic, which remained undiffolved, being tinged 
of a light yellow colour. 
3. Green olive oil was treated in a fimilar man- 
ner with the Sperma Ceti oil, and attended with the 
fame refult. 
4. Thick train oil was digefted with a drachm and 
half of white arfenic. No great alteration was 
obferved in the colour of the oil, though it was 
evidently, rendered clearer and more limpid. 
When the oils were at the greateft heat, a brik 
effervefcence took place in all of them, upon fhaking 
up the bottles, but immediately difcontinued on © 
the arfenic being fuffered to fubfide. When poured 
on 
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