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XXXII. Obfervations on the Gillaroe Trouts 
commonly called in Ireland the Gizzard 
’Trout , by John Hunter, F R. S. 
ReJde, March i 7 »^~\NE of the digeftive organs of 
1774- this trout being fo very re- 
markable as to have given name to the ffth, and 
to be looked upon as its diftinguifhing charadferiftic ; 
it will be neceflary, to take a general view of the 
varieties in the digeftive organs of animals, to de- 
termine what place the ftomach of this particular 
trout holds among them, and alfo to throw fome 
light upon the queftion, whether its refemblance 
to a gizzard be fuch, as to render the name of 
gizzard trout a proper appellation. 
To begin with fome general fadts : the food of 
animals may be divided into two kinds, fuch as 
does, and fuch as does not, require maftication, to 
facilitate the digeftion. All animal food is of this 
latter kind. But grain, and many other fubftances 
which ferve for aliment, require a previous grind- 
ing or trituration ; and therefore thofe animals 
which live on fuch food, are furnilhed with organs 
for that purpofe. Granivorous quadrupeds have 
the two powers, viz. maftication and digeftion, 
feparate or diftindt from one another; the firft 
-being exerted by a fet of teeth of a particular 
form. 
