[ 28 ] 
fall, which I will anfwer for its having done now, 
by the progrefs I faw made towards it for the hour 
that I ftaid j I fay, now, the breadth in that place 
muft be above a hundred yards. ^ 
ExtraEf of a Letter from the fame Gen-^ 
tleman^ to the fatne^ dated December 28, 
1754- 
Read Jan. 23, IT TEfuvius runs bat with one, though 
y that the moft conliderable ftream 
of fire : he has alfo changed his note at top, and is 
now more angry than ever, throwing up ftones and 
matter in greater abundance. 
VII. An Account of the Species of Plants 
from which the Agaric, ufed as a Stjptk, 
is prepared. By Mr. William Watfon 
F. R. S. 
London, Feb. i. 1755. 
Read Feb, 6, y Lately acquainted the Royal Society, 
X I had fome doubts, arifing from 
the pieces I had feen, whether the agaric fent from 
France, and applied as a f yptic after amputations, 
was the fungus in caudicibus nafcens, pedis equini 
fgurUy of Cafpar Bauhin; or the fungus coriaceus 
quercinus^ hcematodes of Breynius, of which I gave 
a fhort hiftory. In order therefore to be confirmed 
in this matter, I wrote to our worthy brother M. 
Clairaut, of Paris, to lay fome queries, I drew up, 
before M. Bernard de Juflieu, and M. Morand, both 
members 
