300 



CHEMISTRY. 



GRAPHIC EXPLANATION OF ISOMERISM. 



QUESTIONS. 



406. Explain the change of views which has taken place with reference 

 to organic substances. What examples of synthesis are given ? What is 

 said of the division into mineral and organic chemistry ? What are or- 

 ganized bodies? How do they differ from organic bodies? Give exam- 

 ples. 407. What are the four chief constituents of organic bodies ? What 

 others occur also ? 408. What is said of the sources of the elements in or- 

 ganized bodies? Show how leaves purify the air for animal life. 409. 

 Show that the subservience of plants to animals is twofold. 410. How is 

 nitrogen furnished to animals ? 411. Give a definition of organic chem- 

 istry. Explain it. 412. Show that the molecules of organic bodies are 

 complex in constitution. How many atoms in a molecule of tartaric acid ? 

 Of starch ? Of stearine? 413. What is said as to the instability of or- 

 ganic substances? Give an example from bleaching. 414. Of what three 



