6z Vegetable Staticki. 



ters anfwer nearly to the following de- 

 grees of heat above the freezing point, viz. 

 Melon-thiftle 3i> Ananas 29, Piamento 26, 

 Euphorbium 24, Cereus 2It, Aloe 19, In- 

 dian -fig \6\ y licoides 14, Oranges 12, 

 Miftles 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. Boyle's Works, Vol. III. 

 p. 54. 



I marked my 6 Thermometers numerical- 

 ly* i> 2 > 3> 4> 5> 6. The Thermometer 

 numb. 1. which was fhorteft, I placed with 

 a South aipect, in the open air 5 the ball 

 of numb. 2, I fet two inches under ground 5 

 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 feverai 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 ftems of the feveral Ther- 

 mometers 5 



