FORMS OF SEED-VESSELS. 129 



herd's purse very different from those at the root," 

 said Henry. 



"True; and that is veiy common; but bracts 

 belong especially to the flower-stalk, not to the 

 general stem, and are very different from these." 



" Then if I find a flower in the shape of a cross, 

 and having pods with a partition down the middle, 



8TVOBD-SHAPED BEAKS OV THE SEED-PODS OF WHITE MUSTARD. 



and netted veined leaves, and no bracts, I may be 

 quite sure it is one of these Crucifers, and safe to 

 eat, if I cannot get a better salad," said Henry. 



" Certainly : but as your observations may not 

 be at first correct, I advise you to bring your salad 

 to me before you eat it." 



Mary remembered that in looking for shepherd's 

 purse for her bird, she had once found a plant very 

 much like it, but with larger and rounder pods. 

 Her father thought from her description that it 



K 



