NUTRITION. 207 



7. We can create neither matter nor force, but are dependent on 

 food as the engine is dependent on fuel. 



8. We are dependent on the green plants for our food. 



9. The animal body utilizes more of the energy contained in food 

 than the engine utilizes from fuel. 



Questions. i . Why is it that some persons eat a large amount of 

 food yet remain thin ? 



2. What is meant by "lymphatic temperament" ? 



3. Classify the organs shown in Fig. 73 according to their functions. 



4. What animal is most thoroughly protected from cold by an 

 envelope of fat ? 



5. How are plants and animals dependent one on the other ? 



