Chap. 4. PoTver of the S U N^ d^c. 137 



fpend a thought about, except it blow fo ve- 

 hemently that they cann't poflibly ftand on 

 their Feet, or that their Houfes are Hkely 

 to tumble down upon their Heads. But thus 

 much of what the Antients call JttraSion^ 

 which is in many Cafes folv'd by Pulfion, or 

 the PreiTure and Elaftick Power of the ^ir, 

 rather than by the Attraftive Power of the 

 Sun. 



That the Vapours of the Seas, Rivers, Heat, #^e 

 Lakes, and all the Humidities of the Ground, ^f J|!^^",„. 

 are thus drawn up, there is fufficient Ocu- 

 lar Demonftration : And that Heat is an A- 

 gent therein, is deducible from the Experi- 

 ment of one of our greateft Modern Natu- 

 ral ifts, (^) who taking a Veffel full of Wa- 

 ter four Inches deep, and feven and tv in 

 diameter, and having warm'd the Water to 

 fuch a degree as he fuppos'd the Air might 

 do it in fome of the hotteft Months, by 

 weighing, he found that in about two Hour's 

 time there was almoft half an Ounce eva- 

 porated, altho' there was no appearance of 

 any Reek or Smoke, neither did the Water, 

 upon the dipping in of the Finger, feem 

 warm^ from which it may be colleded, 

 that in twenty four Hours there would be 

 fix Ounces out of that fmall Superficies of 

 Water. 



The Oxford Society have carried this Ex- 

 periment yet farther ^ for they fuppofing that 



(a) Afr.miky, //i Phitofoph. Tranf. O^M Sept, 1688. 



a Foot 



