6 1 Vegetable Statlcks. 
ters anfwer nearly to the following de- 
grees of heat above the freezing point, vizi 
Melon. thiftle 31, Ananas 29, Piamento 26, 
Euphorbium 24, Cereus 2 It, Aloe 19, In- 
dian -fig i6t, Ficoides 14, Oranges 12, 
Mifties 9. 
Mr. Boyle^ by placing a Thermometer in 
a cave which was cut ftrait into the bot- 
tom of a cliff, fronting the Sea, to the depth 
of 130 feet, found the fpirit ftoo'd both in 
winter and fummer at a fmall divifion a. 
bove temperate ^ the cave had 80 feet depth 
of earth above it. BoyWs Worksy Vol. III„ 
P- 54 - 
I marked my 6 Thermometers numerical- 
ly? I3 2, 3, 4, 5, 6. The Thermometer 
numb. I. which was fhorteft, I placed with 
a South afped, in the open air 5 the ball 
of numb. 2, I fet two inches under ground 3 
that of numb. 3, four inches under ground, 
numb. 4, 8 inches; numb. 5, 16 inches; and 
numb. 6, 24 inches under ground. And that 
the heat of the earth, at thefe feveral depths, 
may the more accurately be known, it is 
proper to place near each Thermometer a 
glafs-tube fealed at both ends, of the fame 
length with the Items of the feveral Ther- 
mometers 5 
