36 



NATURE TEACHING 



wards. The position of the bottle may now be changed 

 again, and once more the root will be found to bend 

 round into the vertical position. 



A round bottle will serve almost as well, but care 

 must then be taken to prevent it rolling. 



Another simple and equally serviceable method is 

 to use a box with a movable front. The atmosphere 



FIG. 3. Germinating beans fixed on the sides of a box with 

 a removable glass front. The beans are fixed with their 

 roots pointing: in different directions, but at the end of a 

 few hours the tips of both roots will be seen to have 

 curved round until they come to point vertically down- 

 wards. 



in the box should be kept damp by means of wet 

 sponges. Pin the seedling bean to the back of the box, 

 and turn the box into various positions, as in the case 

 of the bottle (see Fig. 3). 



Careful drawings should be made showing the 

 position of the root at first, and at intervals after the 

 bottle or box has been turned round. 



