4 1 
Of Birds. 
needs make a lhallower Arch, and fo force the infides of the 
Grinders clofer together. And as the Mill/tones are peck d 
and cut with (mail Guttersjeaft their force (hould be evaded: 
fo the Griftly Lining of the Gizard is all over rough, and 
gather’d into anfwerable Furrows. And becaufe the force- 
able motion of the Grinders, muft needs work the Meat 
from under them: as therefore in fome Mills there is one 
attends foil to turn the Grift under the Stone; fo the Re¬ 
dactor here, to deliver it back to the Grinders, and fo over 
and over, till it be fufficiently elaborated for the Guts. 
And as the ftrong and continual motion of all thefe Muf- 
culesjs taught us from their ftvuctureFo likewife from their 
red colour, which efpecially in the Grinders is intenfe. 
Hence in a Fiji , the Mu/cides which move the Fins are ufii- 
ally Red, although the reft of the Flefh is very white : And 
fo the Leg of a Dome flic/ Fowl. Whereas the Wings alfo 
of a Wild Fowl , are of the fame colour. So likewife the 
Flefh of a driven Calf, or of a Hare , though that of a Coney 
be white. And that which comes nearer, the Heart in all 
Creatures, having the like continual motion, is of a Red 
Colour. . 
The Guts are of different length and bignefs, not always 
proportionable to that of the Bird, but the nature of the 
Meat. So thofe of a Cafowary , though it be neceftary, that 
they (hould contain Meat enough for fo great a Body: yet 
not, that the Meat, which is very nutritive,(hould make any 
long voyage. Yet is it needful there fhould be a Connivent 
Valve before the Rectum, for the guarding of fo open a paf- 
fage. And fo with Variety in other Birds, according as they 
feed on Worms, Seeds , Fruits , Flys, or Sbeli dInfelis^ requiring 
a longer, or more open paftage, for their more deliberate, 
or fafer Tranfmiflion to the Anusa 
The Indentures alfo feem to be made, and with variety, 
to the fame Intent: fc. That the Guts hereby receiving the 
greater Contraction and Dilatation,may fo much the more 
forceably detrude the Meat, or more eafily give way to it * 
as it is fofter, or mixed with Shells, Stones and the like. 
The Caeca, efpecially where large, and made for a further 
Concoction of the Meat; for the better Retention hereof; 
where they open into the Rectum, are, very ftraight. And for 
the fame reafon, alfo thinner and lefs Mufcular than the 
F other 
