332 QUESTIONS. 



peculiar to animals ? Name any plants that possess this power. Any 

 others ? Mention experiments which show that most vegetable sub- 

 stances possess it to some extent. (P. 8.) How is this power mani- 

 fested in the sleep of plants ? Is it easy or difficult to point out exactly 

 the difference between vegetable and animal motions ? What conclu- 

 sion does the author come to, in respect to this subject ? 



How many points of difference does he mention, which distinguish 

 animals from vegetables ? (P. 9.) What is the first? How are ani- 

 mals impelled to make voluntary exertions, and to exercise choice, in 

 obtaining food ? What is the second point of distinction, in regard to 

 the assimilzkUon of food ? What apparent exception is named ? What 

 is the third poimTo4istinction, in regard to the nature of food ? What 

 facts are stated under tM Jjead ? (P. 10.) What is the distinction, in 

 respect to the time of taking fbed ?J What is the distinction, in respect 

 to the powers of feeling and voluntary motion ? How 'do the instances 

 of apparent sensibility and voluntary motion, in vegetables, really dif- 

 fer from these powers in animals ? (P. 11.) What is the distinction, 

 in respect to structure and form? Name the facts which are given 

 under this head. What is the distinction, in respect to chemical com- 

 position ? What are the three essential elements of vegetable bodies ? 

 What additional element is present in animal bodies ? Are or are not 

 other elements occasionally found ? How are animal substances dis- 

 tinguished from vegetable, in the process of burning ? Mention exam- 

 ples. (P. 12.) Why have physiologists endeavored so much in vain 

 to find the distinctive difference between the animal and vegetable 

 kingdoms ? Where must the true distinction be found ? Enumerate 

 some of the distinguishing peculiarities which mark the two kingdoms. 



CHAPTER II. 



GENERAL REMARKS ON THE STRUCTURE OF VEGETABLES. 



(P. 12.) Is the variety in structure and function greater in the animal 

 or vegetable kingdom ? What specimens are mentioned^us extremes 

 in the animal kingdom ? Do they or do they not differ greatly in the 

 number and complexity of their organs? What specimens are named 

 as extremes in the vegetable kingdom? Do or do they not differ 

 greatly in the number and complexity of their organs? 



Describe the general structure of plants, and the course of circula 

 tion ? What class of plants does this description particularly apply to ? 

 In what respect is this arrangement varied in trees and shrubs ? What 

 is the alburnum ? (P. 14.) What peculiarity in the structure of the 



