284 Appendix. 



stamens and pistils one above another, while the calyces and 

 corollas belonging to each series of stamens and pistils were 

 entirely suppressed. In other cases, doubtless, the carpellary 

 whorl is alone repeated, the other whorls of the adventitious 

 flower being completely absent." 



"Another condition, apparently sometimes mistaken for 

 prolification of the fruit, is that in which the carpellary whorl 

 becomes multiplied, so that there is a second or even a third 

 series within the outer whorl of carpels. If the axis be at 

 all prolonged, then these whorls are separated one from the 

 other, and produce in this way an appearance of prolification. 

 This happens frequently in oranges, as in the variety called 

 Mellarose." 



(/.) p. 335. Dimorphism. Two or three cases cited by 

 Mr. Darwin from Gallesio and Risso. " Gallesio impregnated 

 an orange with pollen from a lemon, and the fruit borne on 

 the mother tree had a raised stripe of peel like that of a 

 lemon, both in colour and taste, but the pulp was like that 

 of an orange, and included only imperfect seeds. Risso 

 describes a variety of the common orange which produces 

 rounded-oval leaves, spotted with yellow, borne on petioles, 

 with heart-shaped wings ; when these leaves fall off they are 

 succeeded by longer and narrower leaves, with undulated 

 margins, of a pale green colour, embroidered with yellow, 

 borne on foot-stalks without wings. The fruit, whilst young 

 is pear-shaped, yellow, longitudinally striated and sweet ; 

 but as it ripens, it becomes spherical, of a reddish-yellow, 

 and bitter." 



(/.) p. 369. " Increased number of embryos " (such as the 

 germination of two or more from the same seed). 



(NOTE. This I believe is only the repetition of the mul- 

 tiple normal buds of the axillae of all Citrus. E. B.) 



(;.) p. 389. n Pleiotaxy of the gynacium" (augmentation 

 of the number of the carpellary whorls). 



"The orange is one of the plants most frequently subject 

 to an augmentation in the number of carpellary whorls ; 

 sometimes this is due to the stamens assuming the guise of 

 carpels, but at other times the increase occurs without any 

 alteration in the stamens, or other organs. If the adven- 

 titious carpels be exposed, they are covered with yellow rind, 



