XX WOOD'S CLASS-BOOK OF BOTANY. 



861. How does it appear that the subject is yast ? 



862. Mention a wrong way to study. 



863. What causes the limits of species ? How may the student become 



acquainted with all the individuals of a species ? 



864. Give an example of this mode of study. 



865. Define a genus. Give an example of a genus. 



868. How are the Genera associated into Orders ? 



869. For example, how is the Order CRUCIFEB^B made up ? The Coniferset 



870. Into what groups are the Orders themselves associated ? 



CHAPTER II. 



873. Subject of this chapter ? Illustrate an artificial classification. 



874. Who was Carl von Linne ? What system did he invent ? 



875. What are its defects as a system ? 



876. Are these defects objections to it as a key ? Is it now in use? 



877. How many classes in the Linnsean system ? 



(Further examination at the teacher's option.) 



CHAPTER III. 



886. THE subject ? What is the aim of this system ? 



887. How does it differ from the Artificial System ? 



888. What the principle of the species and genera ? 



889. What rule is given as to the relative value of characters ? 



891. As to history, who may be regarded as the founder ? What did he ? What 



did Linnaeus? Jussieu? Robert Brown? DeCandolle? 



892. What uncertainty in the system yet remains ? 



893. Whence is the difficulty in settling these divisions ? 



894. Is there more than one true Natural System? 



895. What is the first and highest division of the Natural System ? 

 Define the Phaenogamia. The Cryptogamia. 



896. What of the indenniteness of natural groups ? 



897. Into what two provinces are the Pheenogamia next resolved ? 

 State the diagnosis of the Exogens. Of the Endogens. 



898. What divisions next follow ? Define the Angiospermaa. 



Define the Gymnospermae. Name the two classes formed by the Endogens 

 Describe each. 



899. Into what two provinces is the sub-kingdom Cryptogamia divided ? 

 Define the Acrogens. Define the Thallogens. 



900. What two classes correspond with these two provinces ? Define the 



Angiosporae. Define the Gymnosporae. 



901. What name is given to the fourth set of groups ? Are the cohorts quite 



natural groups ? Why not ? 



903. Whose plan is generally adopted in this country ? 

 Into what three cohorts are the Angiospermae divided ? 

 Define the Dialypetalae. The Gamopetalae. The Apetalae. 



904. How is the class Petaliferse divided ? Define the Spadiciflorse. De- 



fine the Florideae. 



905. The class Glumiferae is equivalent to what cohort? 



906. Name the three cohorts of the class Angiosporae. 



907. Name the three cohorts of the class Gymnosporas. 



908. Write on the black-board the synopsis of the Natural System. 



