278 ORGANOGRAPHY. 



the latter are formed by the union of their sides, the dissepi- 

 ments must have the same relation to the styles, as the sides of 

 the blade of a leaf have to its apex, that is, they must be placed 

 right and left of them, or alternate. 



The cavities thus formed, are called cells or loculi, and such 

 an ovary would be termed three-celled or trilocnlar, or if formed 

 of two, four, five or many carpels, it would be described respec- 

 tively, as two celled or bilocular, four-celled or quadrilocular, 

 five-celled or quinquelocular, and many-celled or multilocular. 

 As all dissepiments are spurious or false which are not formed 

 by the united walls of adjoining carpels, it must necessarily 

 follow that a simple carpel can have no true dissepiment, and is 

 hence, under ordinary and normal circumstances, unilocular. 



From the preceding observations it must also follow, that 

 when carpels which are p>laced side by side cohere and form a 

 compound ovary, the dissepiments must be ATrtical, and equal 

 in number to the carpels out of which that ovary is formed. 

 When a compound ovary is composed, however, of several 

 whorls of carpels placed in succession one over the other, as in 

 the Pomegranate, horizontal true dissepiments may be formed 

 by the carpels of one whorl uniting by their bases to the apices 

 of those placed below them. 



We have just observed that all dissepiments are said to be 

 spurious except those Avhich are formed by the union of the sides 

 of contiguous carpels, and it occasionally happens that such 

 dissepiments are formed in the course of growth, by Avhich the 

 ovary acquires an irregular character. These false dissepi- 

 ments commonly arise from projections of the placentas in- 

 wards, or by a corresponding growth from some other part 

 of the walls of the ovaries. Some are horizontal, and are called 

 pitragmata, as in the Cassia Fistula (Jig. 599), where the ovary 

 after fertilization, is divided by a number of transverse par- 

 titions which are projections from its walls; others arc vertical, 

 as in Cruciferous Plants, where the partition called a replum 

 (fig. 600, c/), is formed from the placentas; also in Datura 

 Stramoninvi, where the ovary is formed of two carpels, and is 

 hence nornuilly two-celled, but instead of being thus bilocular, 

 it is quadrilocular below (Jig. 601) from the formation of u 

 s]nirious vertical dissc])iment, but towards the a])ex it is still 

 bilocular (Jig. 602), the dissepiment not being complete through- 

 out, and thus the true structure of the ovary is there indicated. 

 In the Gourd tril)e also, spurious dissepiments appear to bo 

 formctl in a vertical direction by jirojections from the placentas. 

 In the Flax, again (Jig. 603, b), rqiurious incomplete vertical dis- 

 sepiments are formed by jn'ojections from the dorsal sutures. In 

 the Astragalus (Jig. 604), a spurious disseitiment is also tbrmed 

 bv a folding inwards of the dorsal suture, while in O.rytrnpis and 

 Phdca (Jig. 605) a spurious incomplete dissei)inient is jn-oduced by 

 a folding inwards of the ventral suture. Various other examples 



