_Oak_ best for flooring and stair-cases, ii. 321.
_Ohio_, distance of its fort from the sea, iii. 119, note.
_Oil_, effect of heat on, ii. 4.
evaporates only in dry air, _ibid._
renders air unfit to take up water, _ibid._
curious instance of its effects on water in a lamp, 142.
stilling of waves by means of, 144, 145, 148, 150, 151, 154.
_Old_ man's wish, song so called quoted, iii. 546*.
_Onslow_, Arthur, dedication of a work to, by Franklin, iii. 59.
_Opinions_, vulgar ones too much slighted, ii. 146.
regard to established ones, thought wisdom in a government, iii. 226.
_Orthography_, a new mode of, ii. 359.
_Osborne_, a friend of Franklin's, i. 50, 53
_Oversetting_ at sea, how it occurs, ii. 172.
how to be prevented, _ibid._, 173.
_Outriggers_ to boats, advantages of, ii. 173.