124 



ZJfSSOJVS WITS PLANTS 



81), sassafras, tulip tree, mulberry (Fig. 120), and 

 other plants, with respect to variations. He prob- 

 ably will find that variations in lobing are com- 

 monest upon the strongest or most verdurous shoots, 

 and that variations in size are often associated 

 with position in reference to sunlight. 



Fig. 121. 



Primary foliage 

 of red cedar. 



Fig. 122 



Primary and secondary leaves 

 of red cedar. 



135o. The pupil who has access to greenbriers (they are common 

 North and South) should endeavor to determine the significance of the 

 scales a a a, Fig. 119. 



1356. Do the abnormally-lobed leaves on the young shoots of 

 grape, mulberry, and the like, remain the same in form throughout 

 the season ? Or, are these variously-lobed leaves more abundant early 

 in the season than late ? Do they occur chiefly upon the tip of the 

 shoot, or along its entire length ? Suggestions as to the signifioanee 



