Structure and Oeconomy of Whales. 411 
but digeftion is certainly carried on in the fourth ; while in this 
tribe, 1 imagine, digeftion is performed in the fecond, and the 
nfe of the third and fourth is not exa&ly afcertained. 
The caecum and colon do not allii/h in pointing out the nature 
of the food and mode of digeftion in this tribe. The Porpoife 
which has teeth, and four cavities to the ftomach, has no cae- 
cum, limilar to fome land animals, .as the Bear, Badger, 
Racoon, Ferret, Polecat, &c. ; neither has the Bottle- nofe a 
caecum which has only two fmall teeth in the lower jaw; and 
the Piked Whale, which has no teeth, has a caecum, almoft: 
exactly like the JLion, which has teeth and a very different kind 
of ftomach. 
The food of the whole of this tribe, I believe, is fifth ; 
probably each may have a particular kind, of which it is 
fondeft, yet does not refufe a variety. In the ftomach of the 
large Bottle-nofe, I found the beaks of fome hundreds of 
Cuttle -fifh. In the Grampus I found the tail of a Porpoife; 
fo that they eat their own genus. In the ftomach of the Piked 
Whale, I found the bones of different fifth, but particularly 
thofe of the Dog- fifh. From the fize of the oefophagus we 
may conclude, that they do not fwallow fifh fo large in pro- 
portion to their fize as many fifh do, that we have reafon 
to believe take their food in the fame way : for fifh often at- 
tempt to fwallow what is larger than their ftomach s can at one 
time contain, and part remains in the oefophagus till the reft is 
digefted. 
The epiploon on the whole is a thin membrane ; on the 
right fide it is rath#r a thin net-work, though on the left it is a 
complete membrane, and near to the ftomach of the fame fide 
becomes of a confiderable thick nefs, efpecially between the 
two'firft bags of the ftomach. It has little or no fat, except 
what 
