484 MEM O I R S of the 
The Dr. made the following obfervations on the 'BronchocekSt 
a diftemper very frequent all over Lombardy and Savoy 5 by the 
difpofition of this tumor, he is latisfied it has principally its feat 
in the GlanduU I'hyroidede^ andfometimestoo, but very leldom, 
in the Parotides Conglohatae, which laft he could plainly fee 
were noways concerned in the prefent cafe, as he oblerved in fe- 
veral Sronchoceks o^ 2i very great bignefs^ he thinks that thefe 
tumors (generally attributed to the water the people drink being 
melted liiow) proceed from the vifcidity of the Lympha.'^hich 
by degrees extends the membranous coats of the glands, and be- 
ing there congealed, hardens them to that degree, that an inve- 
terate Srow^(7<:^/^ is almofllike a ftone^ but it is difficult to give 
a good realbn why thefe fwellings are to be feen no where elfe, 
but in thefe glands of the neck ; it is probable that the natural 
conformation of the GlanduU Tbyroideae (which being of a har- 
der and more folid fubftance than other glands, fooner flop the 
vifcid Lympha) is the occaiion of this tumor's always beginning 
and fettling there. The Sal Montis Vefuvii is found in pretty 
large lumps, after that mount Vefuvius has thrown out vafl 
'quantities of afhes 5 the great rains that fall upon thefe afhes 
make a fort of lee, which, being lodged in hollow places, arc 
evaporated by the heat of the fun, and there remains behind this 
urinous fait, whofe tafle is fbmething like fal-armoniac. 
At the Sulfatara, between Naples and 'Puzzolo they make 
allum in the following manner 5 in the fummer-tirae they gather 
as much earth, as they have occafion for, which is in the middle 
of a large area, and they keep it in a dry place 5 afterwards 
they put it into lead-kettles of a pretty good thicknefs, and pour 
rain-water thereon, which is alfo impregnated with the lame 
mineral 5 for which purpofe, they take care to dig fome large pits, 
to preferve the rain-water, which they convey into a large ciflern 
hard by the kettles 3 they take away the earth when the Z/x/- 
vium is made, and as it grows llrong by evaporation, they put it 
from one kettle into another, till it is fufficiently evaporated j 
then they take it out, and convey it into a wooden tub, where 
after it has cooled, you lee the allum flick to the fides of 
the veffel, in the form of cryflals; but the mofl remarkable 
thing is, that thefe kettles are let upon fome of the large Spira- 
cula 5 where, without any expence of fuel, only by the violent 
heat of thefe Effluvia, the evaporation is conflantly made luffi- 
cient for the cryftalization ; all this laboratory, where the ket- 
tle, ciflern, and tubs are, is only tied overj the governors of the 
great hofpital of the Annunciata^ who have been at the charge of 
this 
