( 717 ) 
prevented the Water in it from exceeding the due 
Height. To break the 'Force of the Water running in- 
to the two lowermoft Vcflels, they were each of them 
- divided by a Board , placed perpendicujar , but nor 
reaching the Bottom, which feparated the Part where 
the Water came in, from that where it went out. ' 
The j^pparatus being thus fixt, three of the round 
Holes in the Bottom of the (econd Veilel were un- 
ftopr, to let the Water run into the lower Veflel. Where 
not running out at the Sedion in the fide, fo faft as it 
came in from above, it rofe to a confiderable Height 
above the Surface of the dead Water ; after which, the 
Efflux of the Water becoming equal to the Influx, it 
rofe no higher. 
In other Tryals the Water being fuffer’d to run fiom 6 , 
from 9, li, and 15 of the round Holes, the Water rofe 
fuccefflvefy to greater Heights, before the Sedion dif* 
charged it as fall, as it came in. 
The Experiment being repeated with opening other 
Numbers of the round Holes, with Sedions of diffe- 
rent Breadths, and at different Depths of the dead Wa- 
ter, rhe icveral Heights, to which the Water rofe in the 
Veffel, w'ere carefully obferv’d and fet down. 
Other Experiments were made by placing the lower 
Veffel on dry Ground, and the feveral Heights to which 
the Water rofe in the Veffel, according as different Quan- 
tities were fuffer’d to run in, were likcwife obferv’d, 
and found agreeable to the Heights deduced by Calcu- 
lation from the general Theorem above-mention d, con- 
cerning the fimple Motion of Water. 
The Learned Author comes now to apply thefe Ex* 
periments, in order to difeover the Theory of mixe 
motion, to which end he lays down thefe two Hy- 
pothefes. 
A a a I a a 
Firfl, 
