SUBSTANCES FORMING THE BODY; OXIDATION 55 



93. THOUGHT LESSON. 1 The Tissues. i. Which tissue 

 has the largest amount of intercellular material ? 



2. Which tissue has no fibers and very little intercellu- 

 lar material, but is composed almost wholly of cells ? 



3. The walls of the arteries contain more of the yellow 

 fibers of connective tissue than the veins. Which have 

 more elastic walls? 



4. Which tissues have cells without branches? Which 

 tissues have cells with branches ? Which tissue has two 

 kinds of cell-branches or fibers ? 



5. Does fat accumulate in the body within the cells or 

 outside of them (Fig. 38)? 



6. Which cell has the greatest variety of functions ? 

 Which cells are the seat of great activity and change ? 

 Which are moderately active ? Which are very inactive ? 



7. Which tissue gives the least evidence under the mi- 

 croscope of having been formed by cells ? 



8. Do adjoining cells have a common wall separating 

 them, or does each cell have its own wall? Are instan- 

 ces of both kinds of cells to be found ? 



9. Choose a cell and write its " biography." 



10. How does a tissue grow? Does a scar on a child, 

 or a " brand " on a calf or other young animal, enlarge as 

 its body grows ? 



11. State the difference between albumen and albumin. 



1 The teacher may require the answers to the questions in this Thought 

 Lesson to be prepared in writing. In class the pupils should change (but not 

 exchange) papers, and criticise and correct the answers as they are read aloud 

 from different papers. The same plan is applicable to the other Thought 

 Lessons. 



