THE PISTIL. 



I2 3 



the same terms are used to express these facts in regard 

 to them. In a straight or orthotropous seed, the micro- 

 pyle being at the apex, you find an inverted embryo, like 

 Fig. 378. In this case the embryo is said to be antitropal, 

 or reversed. 



FIG. 379. 



FIG, 378. 



FIG. 382. 



FIG. 381. 



If the micropyle be turned to one side, the embryo 

 will be oblique, as seen in Fig. 380. In this case the em- 

 bryo is said to be heterotropal. Fig. 379 represents the 

 seed which is shown in section in Fig. 380. 



If the seed be inverted, or antitropous, the embryo will 

 be erect, as shown in Fig. 381. Here the embryo is said 

 to be orthotropal. 



When a seed is curved upon itself so as to bring the 

 orifice next the hilum, or point of attachment (campylo- 

 tropous seed), you may find the embryo presenting the 

 appearance shown in Fig. 382. 



When the embryo is in the center of the albumen (Fig. 

 381), it is said to be axial j and when not in the center, it 

 is said to be .excentric. 



There are two modes of folding to which the embryo 

 is subject, which occur uniformly in certain groups of 

 plants. They are cotyledons decumbent that is, with the 

 radicle folded against their edges ; and cotyledons incum- 

 bent, having the radicle folded against the back of one of 

 them. 



