Viii INTBODUCTION 



2. The Method: i, e., how tlie question is to be 

 answered, by observation or by experiment. In the 

 latter case a simple sketch of the apparatus should be 

 made. 



3. The Material: i. e., what plants are to be used, 

 how many and in what condition. 



4. Times op observation of the experiment, e. g., 

 every hour, every day, etc. 



5. Precautions AND sources of error: these should 

 be discussed as fully as possible before starting the 

 experiment. Such discussion provokes thought, criti- 

 cism and lively interest. Never forget to have control 

 experiments. 



6. Results: these should be presented concisely 

 and clearly, in tabular form when possible. 



7. Conclusions: distinguish between what is proven 

 and what is indicated or rendered probable. Dis- 

 cordant results should be given full consideration : they 

 often suggest a new experiment or a repetition under 

 modified conditions. 



8. Practical Applications and Related MaTTERS: 

 under this head the general knowledge and the mis- 

 cellaneous observations of the class may be organized 

 and crystallized into something definite. Information 

 should be obtained from farmers, gardeners and other 

 practical men, the discussion of which will provoke 

 new questions and experiments. 



Notes may be made under each of these heads. 



