14 NATURE TEACHING. 



PRACTICAL WORK. 



The following exercises are suggested in 

 illustration of the principles already discussed ; 

 they may be performed by the pupils them- 

 selves or by the teacher and used by him as 

 demonstrations in his object lessons. They 

 admit of considerable modification and varia- 

 tion, and, in their present form, are intended to 

 be merely suggestive. The precise manner in 

 which they are conducted must necessarily 

 depend on the circumstances surrounding each 

 class of students. 



THE CONDITIONS FOR GERMINATION. 



I. Moisture, air and warmth are neces- 

 sary for the germination and continued growth 

 of seeds. In order to demonstrate this take 

 four rather small but wide mouthed bottles, 

 two of which are furnished with good corks. 

 Label these bottles A, B, C and D respect- 

 ively. In A, having first taken care that it 

 is perfectly dry, place some dry seeds, (corn, 

 peas or beans) cork the bottle and seal with 

 sealing wax or bees-wax. In B, place two or 

 three layers of wet blotting paper at the bot- 

 tom, then put in the seeds and cork and seal 

 as. before. Treat C and D exactly as B but 

 leave the bottles uncorked. 



