OBSERVATIONAL LESSON XXTII 



PART I A TUBER (continued, 4=th Investigation) 

 PREPARATIONS FOR WORK 



Distribute the potato tubers. 



DIRECTIONS FOR THE PUPIL 



(1) Write down : Make : Leave : 



As many points of likeness A sketch of A space for a 



between the potato tuber the tuber as finished 



and the bean seedling as it now ap- drawing 



you can. Indicate any pears 

 differences also. 



Fill up the boxes with earth to encourage the formation of young 

 tubers. 



PART II A WOOD-LOUSE (continued, 2nd Investigation) 

 PREPARATIONS FOR WORK 



Obtain wood-lice and confine them as before (see page 43). 



53 



