310 AURANTIACE^. [part ii. 



botanists to be a kind of berry, is in fact a seed- 

 vessel with numerous cells, divided by dissepi- 

 ments and a central placenta {a) ; the cells being 

 the quarters of the Orange, the dissepiments 

 the divisions between them, and the placenta 

 the central pith. When the flower first ex- 

 pands, the ovary, if cut open and examined, 

 will be found to be divided into several cells, 

 each containing two rows of ovules. As in the 

 preceding genera, however, many of these ovules 

 become abortive ; and as the cells fill gradually 

 with cellular pulp, the seeds become detached 

 from the placenta, and buried in it. The seeds 

 themselves are very interesting ; they are 

 covered with a thick wrinkled skin, and they 

 show distinctly the hilum (c in Jig. 121), the 

 chalaza (d) and the raphe or connecting cord 

 between them, parts which are seldom to be 

 distinguished in seeds with the naked eye. 



The leaves, calyx, and petals of the Orange, 

 if held up to the light, appear covered with 

 little dots. These dots are cells, covered with a 

 transpai'ent membrane, and filled with a kind 

 of oil, which is exceedingly fragrant. The rind 

 of the fruit is covered with similar cells, filled 

 with a pungent oily liquid. The leaves are 

 smooth and shining ; and they are articulated ; 

 that is, they can be separated from the petiole 

 or footstalk without lacerating them. In most 



