The fall of great Rains and Hails, ^d. The great Quan- 
tity of nitrous and Sulphureous Exhalations in Earthquakes. 
4?/?. The Soudain melting of Snow in the High Mountains ; 
hnd from thefe feveral caufes combined, he thinks he can 
account for all the Phaenomena of Winds, particularly the 
Trade Winds between the Tropcks, called by him Fept^s AH- 
zezy but in fo doing he feems not fufiiciently informed in 
their Hiftory : In this Difcourfc are feveral curious Re- 
marques, and Obftrvations touching the Courfe, Propaga- 
tion, c^c. of the Wind. 
The fecond Part Treats of the ^^///7/^m;%! of Fluids ; 
the firft Difcourfe demonftrating from the Principles of 
Mechanicks, how Fluids counterpoile one anothers weight, 
and giving the Rules of the Doftrine of floating Bodies : 
The fecond Difcourfe fhews the Nature of the EUfikity of 
Air and Flame, and how their Spring is counterpoised by 
weight. The third Difcourfe Treats of the EquipoUence 
of a Fluid Body to a fl:roak or fhock ; fhewing the Rules of 
the force of J^-/^^/^/^^, frorn feveral hights of the Referva- 
tory, and differing Diameters of the Bore of the Pipe ; gi- 
ving in tlieend an account of the comparative force of 
Wind and Water-mills, with the manner of computing 
them ; togather with a Defcription of 3 or ^ forts of Mills 
with HorizoMal Sailsj and the Authors Opinion thereupon; 
The third Part Treats of the Me^fui^ of running and 
fpoiitiag Waters j in the 1/. Difcourfe, are produced feW- 
ral e)^perimcnts to find the quantity of \yater paffing 
.through a Bore of an Inch Diameter, juft under the Surface 
of the Water, which at length is cojucluded to be Paris 
Pirns m ^iMmMf ^^ in ^ natural D^y: vt^lieFe 
ty the way , no^ce i$ i:a.ken pf th^lengt^^^ 
vibrating leconds, in pait5 near the Equino^id^^liiyin^^^ 
fouiid at C^y-eme^ teijith^ a^d a^t Ille oF <Jt:?w, ne^ 
Cdfe. Vsrdi^,y, ^j^ .pigbfh ^n .jhi^k. flprter, t!i4n at Pa^tJt^ 
of wliich thp C^alsmvpQiQ^ fo Pi^deied ^Fo/n the diiiM 
Motion of theEarffi. ^nor:;^;;;^.dnr . ;r;cq 
The 
