EXAGGERATION OF GROWTH 49 



from metamorphosis of the remains of an aborted organ. Thus, in the 

 staminate willow-flower (Fig. 12) a small gland between the bases of 

 the stamens is supposed to represent the aborted pistil, while similar 

 ones at the base of the pistil, in the pistillate flower (Fig. 9), are supposed 

 to represent the aborted stamens. 



The misleading efl^ects of suppression have been observed in Hepatica 

 (Figs. 23 and 24) in the absence of the corolla, the metamorphosis of 

 the calyx toward corolla and of the epicalyx toward calyx. Those of 

 abortion are seen in the Pulsatilla (Fig. 16), where the petals b and c 

 are reduced to simulate fllaments. 



Exaggeration of Growth is well displayed in the torus of the straw- 

 berry and the placentae of the watermelon (Fig. 312), which respec- 

 tively contribute the massive edible portions of those fruits. 



The principles of anthology as applied to the higher types of plants, 

 having thus been followed into and through the typical flower, and the 

 general nature of the deviations therefrom having been outlined, we 

 shall proceed to a detailed consideration of the several parts of the 

 flower, with the object of preparing us to interpret the multiform 

 appearances which those organs present in the extensive flora from 

 which our drugs are derived. 



That division will not, however, close our consideration of flower 

 structure, as some important modifications will remain to be discussed 

 in our chapter on pollination and fertilization. 



