OBSERVATIONAL LESSON XXII 



PART I A TADPOLE (continued, 3rd Investigation) 

 PREPARATIONS FOR WORK 



The tadpoles will be re- 

 quired. 



A preserved set of speci- 

 mens showing the whole 

 series of changes may be at 

 hand. 



FIGURE 170. A Tadpole, 7 days old. 



DIRECTIONS TO THE PUPIL 

 (1) Repeat your observations as before. 



SUGGESTIONS FOR FURTHER WORK OUT OF SCHOOL 

 Owing to the impossibility of watching all the stages during school 



FIGURE 171. A Tadpole showing the hind limb. 



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