[ 235 ] 
mal, nor from the Eagle to the humming Bird, but 
can utter a Voice, fo he thinks the fame general 
Law is obferv’d in the Occonomy of Fifties : But at 
the fame time our Author here fccms to lay too 
A much Weight upon what he fuppofes final Caufes, 
and mctaphyfical Arguments, which have in all 
Ages ruin’d Natural Philofophy. 
But the Letter-writer queries, whether Fifties may 
not be mute in our Air, and yet capable of fome 
Voice in their own Element. Our Author takes the 
Noifc which Carp and fuch Fifh make in hot Wea- 
ther, on the Surface of the Water, to be a Voice : 
And this is moft remarkable when the Male im- 
pregns the Row which the Female has before de- 
pofitcd 5 yet this is often heard, when the Fifti is 6 
or 7 Inches under Water. Our Author further enu- 
merates many foreign Fifties, and particularly our 
Smelt, which put alive into Vinegar hifles very au- 
dibly. 
The Letter-writer had obje&cd againft Fifties, that 
they have no Occafion for Hearing, becaufe they 
never copulate, as other Animals do: But our Au- 
thor deferibes the Manner of Whales, which is per- 
formed as that of other Animals j and obferves, that 
they bring forth their Young alive: Thcfc follow 
the Female, and luck Milk from the Teats, which 
arc placed in them near the Organs of Generation 5 
and in violent Storms the Dam rakes her Off-fprmg 
into her Mouth, and protects them from Danger. 
This laft is common to feveral of the Skate-kind. 
The Letter-writer alleges. That Fiih never llcep ; 
but our Author allures us, all fuch as have Lungs do 
in the Night-time, thrufting up their Noftrils into 
H h the 
