OBSERVATIONAL LESSON XXII 



hours, it would be advisable to keep a few frog and newt tadpoles in 

 your aquaria and compare the two. 



FIGURE 172. A Tadpole showing hind and fore limb. 



PART II THE DEVELOPMENT OF A BUD (continued, 2nd 

 Investigation) 



PREPARATIONS FOR WORK 



Distribute the horse-chestnut buds which have been 

 kept in water. 



DIRECTIONS TO THE PUPIL 



(2) Repeat the operation carried out in the 

 last lesson upon the bud (see page 36, 

 paragraph 3). 



PART III A WOOD-LOUSE 

 PREPARATIONS FOR WORK 



Some specimens of that common species of wood- 

 louse which has the power of rolling into a ball, should 

 be collected and placed in small loosely covered jars such 

 as were recommended for use in the growing of moulds. 

 (See Part I, pages 68 and 146.) 



It will be necessary to adopt some means of keep- 

 ing the atmosphere moist, within the jar. This may be 

 done by inserting a strip of rag which has been wetted 

 and made into a roll. 



a bunch of young flowers 



