VARIATION IN LEAVJCS 



125 



of these variant leaves may be found in "The Survival of the Unlike," 

 Essay III. 



136. Red cedar (or savin) foliage is peculiar. 

 If the pupil examines young trees and vigorous 

 shoots, he will find 

 the type of foliage 

 shown in Fig. 121. 

 These leaves suggest 

 the foliage of the 

 spruces and firs. 

 Fig. 122 is from 

 the same tree, and 

 represents a bit of 

 a short branchy 

 growth, such as oc- 

 curs when the tree 

 begins to bear seeds. 

 The main stem, in 

 the figure, bears the 

 awl- shaped leaves, 

 from the axils of 

 which branches arise 

 which bear appressed scale -like leaves. The pu- 

 pil may now examine the common retinosporas, 

 or Japanese arbor vitse, of gardens ; also the 

 common arbor vitse, or so-called white cedar. He 

 wUl come to the conclusion that these differences 

 are not incidental variations (that is, not due to 



Pig. 123. 

 Foliage of the old-fashioned tomatoes. 



