[ ”7 ] 
Hence therefore, in comparing different experi- 
ments, as fome fall fhort, and others exceed the 
maximum, and all agree therewith, as near as can 
be expected, in an affair where fo many different 
circumftances are concerned ; we may, according to 
the laws of reafoning by induction, conclude the 
maxim true ; viz. that the effects are nearly as the 
quantity of water expended. 
Maxim II. 'That the expence of water being the 
fame , the effect will be nearly as the height of the 
virtual or effective head. 
This alfo will appear by comparing the contents 
of columns 4, 8, and 10, in any of the fetts of ex- 
periments. 
Example of N°. 2. and N°. 24. viz. 
N°. Virt. Head. Expence. EfFe&. 
2 15 264,7 1266 
24 — 4>7 262 3 8f 
Nov/ as the expences are not quite equal, we muft 
proportion one of the effects accordingly : thus 
by maxim ift, 262 : 264,7 :: 3 By : 389 
and by max. ad, ly : 4,7 :: 12 66 : 3557 
Difference 8 
The effect therefore of N°. 24. compared with N°. 
2. is lefs than according to the prefent maxim in the 
ratio of 45) : 50. 
The foregoing, and two other fimilar examples, 
are comprifed in the following Table. 
Examples 
