MORPHOLOGY OF THE FRUIT AND SEED 235 



In other cases more important changes take place during 

 the ripening of the ovary which disguise the real structure of 

 the fruit. These changes either arise from the addition, abor- 

 tion, or alteration of parts. 



1st. The addition of parts is commonly produced by the 

 formation of the spurious dissepiments already alluded to. In 

 Datura Stramonium, for instance, we have a two-celled ovary 

 converted into an imperfectly four-celled fruit by the formation 

 of a spurious vertical dissepiment {figs. 419 and 420) ; this 

 dissepiment appears to be formed by the projection of the 



Fig. 502. 



Fig. 503. 



Fig. 504. 



Fig. 505, 



Fuj. 502. Trausverse section of tlie fruit of Fretiea zangueharica. Prom 



Lindley. Fig. 503. A vertical section of a cell of the ovary of Tribirlus 



terrestris. o, o, o. Ovules, c. Projections from the wall winch are com- 

 mencing to separate the ovules. Fig. 504. A vertical section of a cell of 



the mature ovary or fruit of the same,.in which the partitions, c, com- 

 pletely separate the seeds, g. Fii/. 505. Pseudocarp of the Strawberry. 



placentas on the two sides, which meet and become united to 

 corresponding projections from the dorsal sutures. In Cassia 

 fistula, again {fig. 417), and some other fruits of a similar 

 nature, we have a one-celled ovary converted into a many- 

 celled fruit by the formation of a number of trausverse dissepi- 

 ments. In Pretrea zangueharica, a one-celled ovary is converted 

 into a six-celled fruit {fig. 502) by an extension and doubling 

 inwards of the placenta. In Tribulus terrestris the ovary is 

 five-celled ; but as it approaches to maturity, each cell {figs. 503 

 and 504) becomes separated into as many divisions as there are 

 seeds contained within it, in consequence of a, corresponding 



