[ 464 ] 



Table of the Heights of Air in Feet, which cor re/pond with the Weight 

 of one tenth of an Inch of Mercury or 344,32 Grains. Jrom 

 Barometer '^i to 15.* Temperature 32**. 



•Taken from Sir George Shuckburgh's table. Phil. Tranf. 1777, p j86. 



