OBSERVATIONAL LESSON XXVII 



PART I A GROWING POTATO 

 PREPARATIONS FOR WORK 



Distribute the potato plants. 



DIRECTIONS TO THE PUPIL 



(1) Remove some of the soil if necessary, and draw a " new " tuber 

 showing how it is joined to the old plant. 



PART II A SNAIL 

 PREPARATIONS FOR WORK 



Common snails, well grown, and which have been recently wetted, and tubular 

 lamp chimneys should be handed round. 



FIGURE 204. The Common Snail. 



