ISO 



PROSERPINA. 



awkwardness of the transition from the tubular form 

 of the staff to the flat one of the flag. The mode in 

 which this change is effected is one of the most inte- 

 resting features in plants, for you will find presently 

 that the leaf-stalk in ordinary leaves is only a means 

 of accomplishing the same change from round to flat. 

 But you know I said just now that some leaves 

 were not flat, but set upright, edgeways. It is not 

 a common position in two-leaved trees ; but if you 

 can run out and look at an arbor vitse, it may 

 interest you to see its hatchet-shaped vertically 

 c crested cluster of leaves trans- 



forming themselves gradually 

 downwards into branches ; and 

 in one-leaved trees the verti- 

 cally edged group is of great 

 importance. 



10. Cut out another piece 

 of paper like a in Fig. 21, but 

 now, instead of merely giving 

 it nicks at a, b, cut it into the 

 shape A, Fig. 23. Roll the 

 lower part up as before, but 

 instead of pulling the upper 

 part down, pinch its back at the dotted line, and 

 bring the two points, a and b, forward, so that they 

 may touch each other. B shows the look of the 



Fig. 23. 



