de the other processes of digestion?

5. What is the work of the tongue in digestion?

6. State the purposes served by the gastric juice.

7. Give reasons for regarding the small intestine as the most important
division of the food canal.

8. At what places, and by the action of what liquids, are fats, proteids,
and starch digested?

9. What enzymes are found in the pancreatic juice? What is the digestive
action of each?

10. Describe the work performed by the muscles of the stomach, the mouth,
the esophagus, and the small intestine.

11. What advantages are derived from the use of cooked food?

12. State the advantages of drinking pure water.

13. If all the food that one needs to take at a single meal can be
thoroughly masticated in fifteen minutes, why is it better to spend a
longer time at the table?

14. What is meant by the overlapping of meals? What bad results follow?
How avoided?

PRACTICAL WORK

Examine a dissectible model of the human abdomen (Fig. 75), noting the
form, location, and connection of the different organs. Find the
connection of the esophagus with the stomach, of the stomach with the
small intestine, and of the small intestine with the large intestine.
Sketch a general outline of the cavity, and locate in this outline its
chief organs.

Where it is desirable to learn something of the actual structure of the
digestive organs, the dissection of the abdomen of some small animal is
necessary. On account of unpleasant features likely to be associated with
such a dissection, however, this work is not recommended for immature
pupils.

[Fig. 75]

Fig. 75--Model for demonstrating the abdomen and its contents.

*Dissection of the Abdomen.* (Optional)--For individual study, or for a
small class, a half-grown cat is perhaps the best available material. It
should be killed with chloroform, and then stretched, back downward, on a
board, the feet being secured to hold it in place.

The teacher should make a preliminary examination of the abdomen to see
that it is in a fit condition for class study. If the bladder is
unnaturally distended, its contents may be forced out by slight pressure.
The following materials will be needed during the dissection, and should
be kept near at hand: a sharp knife with a good point, a pair of heavy
scissors, a vessel of water, some cotton or a damp sponge, and some fine
cord. During the dissection the specimen