$$0 Mr. Home's Comparison of the Stomachs of 
this part to the pylorus the membrane is more smooth, and 
made up of minuter parts. Vide Plate VI. fig. 6. 
No. VII. The Common Rat. 
The stomach of the common rat has a general resemblance 
in its appearance to that of the water rat, but differs from it 
in having no permanent division between the two portions of 
which it is composed. When examined recently after death 
there is a contraction dividing it into two parts ; but when 
distended this disappears, and the whole becomes one cavity ; 
so that in this animal the division is only muscular, which in 
the water rat is permanent. 
The first cavity bears a greater proportion to the whole 
than in the water rat ; it is about f instead of f. The first ca- 
vity is lined with a cuticle, which terminates in a line like a 
thread, formed by a doubling of the cuticular edge, but not 
projecting or serrated, as in the water rat. This line surrounds 
the stomach, but projects furthest on the lower part or great 
curvature, where it terminates in a point : there are also the 
two lateral cuticular processes as in the water rat, but less 
conspicuous from not being prominent, and much smaller. 
The internal surface of the second cavity so entirely corres- 
ponds with that of the water rat, as to require no particular 
description ; only the orifices of what I consider to be the sol- 
vent glands are less readily detected. 
The stomach of the mouse is similar to that of the common 
rat in its general characters. 
No. VIII. The Horse. 
The stomach of the horse, as it is most commonly met with 
after death, appears to be an oval bag, the internal surface of 
