OBSERVATIONAL LESSON XX 



29 



PART II A DEVELOPING CHICK (continued, 2nd Investigation) 

 PREPARATIONS FOR WORK 



Hen's eggs that have been incubated for three days will be required. 



DIRECTIONS TO THE PUPIL 



(2) Open the egg as before. 



Eefer to your sketch made at 

 the last lesson and describe the 

 changes that have taken place. 

 Sketch also the developing 

 chick. 



Is the chick alive ? Why do 

 you say yes or no ? 



(3) Answer the questions : 



(a) What is the use of the 

 yolk and white of the egg ? 



(b) Why does the chick take 

 longer than the frog to 

 develop ? 



(c) Is the chick at this 

 stage like anything you 

 have ever seen ? 



(d) What parts can you see already partly formed ? 



FIGURE 164. A developing Chick, three 

 days old. 



