2. If eggs are to be preserved, they should not be washed unless their condition compels it, as washing removes the natural covering of the pores. They should be stored in a clean, cool place, and packed as soon as possible.
Lesson II
COMPOSITION
It is wiser to develop the food substances in an egg by reasoning, rather than by examining the different parts. The shell is not used for food, so it is the contents that should be studied. The class should be guided in the following sequence of thought:
1. An egg is designed by nature to become a chicken, so it must contain all of the substances necessary to build a chicken.
2. A chicken is an animal, and all animal bodies are made of the same substances. These we have seen to be mineral matter, protein, and water.
3. An egg therefore contains these three substances.
4. An egg must also contain three weeks' food for the chicken, therefore must have fuel food as well. This fuel food is found in the yolk, in the form of fat.
5. The yolk therefore contains water, mineral matter, protein, and fat.
6. The white contains water, mineral matter, and protein.