During the digestion of certain foods in the intestine more or less gas is evolved. The gas, by distending the walls of the gut, serves the purpose of keeping them from agglutinating, and thereby facilitates the free movement and intermingling of the digestive fluids and food, and the absorption of the latter.

Ruge has published the following table of the percentage of gases evolved by several different kinds of foods:

Food.

MILK.

MEAT.

PEAS OR BEANS.

1.

2.

I.

2.

3-

I.

2.

3

CO2....

16.8

9.9

13-6

12.4

8.4

34.0

38.4

2I.O

H......

43-3

54-2

3.0

2.1

0.7

2-3

1.5

4.0

CH4

0.9

• • • •

37.4

27.5

26.4

44-5

49.3

55.9

N,.....

38.3

36.7

459

57.8

64.4

I9.I

10.6

18.9