The First Steam-Boat

Bones and Sinews could not fuftain it, but if you cut a Hole in the Top of a lare'e Veife] and then lay your Body on it in fach manner as that the Air cannot oafs by you into the VeffeJ, and then Punin the Air out of the Veflel, you will very feniibly feel the weight of the Air, for if the Hole is large, you will not be able to Separate younelf from the Veffel, but when the Air is let in -you are immedi- ately relieved. Since it igdemonftrated, that the^iris of itfelf offuch weight, it may Teem fb-anæe it is not more fenfibly felt to prefs on hu- man Bodies; The Reaion is this, there is no Particle in a Man’s Body,, bur i$ made up with Matter full as heavy as Zir and moll o£ -the Particles a great deal hea- vier-, therefore every part defends it fe]£ within and without., without beingpreffed in, for every Body that is heavier than a Fluid being, i mm ened therein, defends it- lelf from, external TrelTure : Tor when you Jmmerfe a Toft Body, that is Homo- geneous in Water ever To deep, it this Body is more Denfe than Water, the Prefi'ure ot the Water will not alter the form of this foft Jfody, But if a Man were to Dive in the Wa- ter very Jeep, the Water would prefs his Body to a great Degree, notwith- Æandinæ