(510) 
fotiie of thd nioft Eiiiinifftt Philofophers of this Age; amongn: 
whom he names the lUuftrious Bacon , Des Cartes^ Tvrrhehj 
Boyle ^ Kobervdl^ Pajchal^ Bngens^ and Guerick, 
Of thefe XVr Effays, 
The firjl, reprefents and explains the Diving Bell , its Stru* 
flureand Ufe, 
The [econd^ exhihics the chief Optique Fhanomemoi a Dark- 
ned chamber, and fhevvs their Caufes. 
The third, relates the EfFeds of the Barofcope or the Tor- 
r/V(?il(/^^ Quickfilver Tube , and withal gives the reafons of 
them. 
The/i)m^,fhews fome Experitdentsof f mie merallin weights 
floating, and without any other fupport freely pendulous in Wa- 
ter and Air \ reducing them to their Caufes. 
The fifths reprefents both to the Eye and the Underftanding 
fome other Hydroftatical P/'^^^i^wf^^^ , about Glafs-bubles , at 
firfl floating on the farfaceef the water, and afcerwards fubfiding 
by afFufedoyl,c^^. 
I hefxtb^ deduces fjme ConfeCimes from the before afTerted 
Spring and Weight of the ever-gravitating Air ; and thofe 
very Confedaries prov'd by the fenfe of the Eyes them- 
felves. 
The [eventh ^ contains fome Experiments of a Glafs-Tube, 
fix and thirty feet high , filled with water, and declares 
their Caufes from the <L^^uilibrium of the Air and fo much 
Water. 
The eighth , fhews fome Phammem in very flender or nar- 
row Tubes, viz>. the Afcent of water in them above its other 
fuperficies ; fubjoining withal the reafon thereof. 
The mnJh, exhibits the Effeas,and declares the Caufes of fcve- 
ral forts of Thermometers. 
The tenthy mentions a very paradoxical Experiment Franc. 
The eleventh^Yeprefents and reduces to its principles the Force 
of Mechanical Powers, particularly that of a certain flender 
wooden Engin, which he faith was of fuch a power , that a 
Child of two years old , turning the handle thereof, did in his 
prefencc lift up a weight of i oo Z ^d at another time, a weight of 
^QoK ^ The 
