OBSEEVATIONAL LESSON XVIII 



PART I A SEEDLING (continued, 3rd Investigation) 

 PREPARATIONS FOR WORK 



Distribute the dwarf bean seedlings which have been grown in soil. 



DIRECTIONS TO THE PUPIL 



(l) Note down : 



The number of leaves on your 

 plant and mark one of them 

 so that you can measure its 

 increase in size during the 

 next lesson 



Make : 

 A sketch of 

 the seedling 



drawn 

 scale 



to 



Leave : 



A space for a 

 fin is h e d 

 drawing 



PART II FROG'S EGGS 

 PREPARATIONS FOR WORK 



A small piece of frog's spawn should be placed in a 

 glass and given to each pupil. The eggs to be examined 

 should be as young as possible (those which are light 

 coloured must be chosen). Pocket lenses will be useful. 



Note .-If the frogs have not yet spawned, prepare for 

 the alternative part of the lesson. 



DIRECTIONS TO THE PUPIL 



m 



FIGURE 145. A Frog's 

 egg- 



(2) Observe and describe an egg and its surrounding jelly- 

 of what use is the latter ? 



