EMBRYOS. 360 



nary circumstances cease to grow (see ante, p. 364). In 

 the case of a ripe nut with two seeds it might be im- 

 possible to tell whether the adventitious seed were the 

 product of multiplication, or whether it belonged, in 

 the first instance, to the same carpel as that producing 

 the fellow-seed, or to a different and now obliterated 

 ovary. In all probability, however, the second seed 

 would be accounted for by the development of two 

 seeds in one carpellary cavity. 



There is still another condition occasionally met with 

 in the almond, and which must be discriminated from the 

 more common multiplication of the seed, and which is 

 the multiplication of the embryos within the seed, 

 and which furnishes the subject of the succeeding 

 paragraph. 



Increased number of embryos. A ripe seed usually con- 

 tains but a single embryo, although in the ovular state 

 preparation is commonly made for more ; and, indeed, 

 in certain natural orders plurality of embryos in the 

 same seed does occur, as in Gycadece and Coniferce. In 

 the seeds of the orange {Giti-us), in those of some Euphor- 

 hiaceoB, &c., there are frequently two or more additional 

 embryos. A similar occurrence has been recorded in 

 the mango, for a specimen of which I am indebted to 

 the Rev. Mi-. Parish, of Mouhnein.^ 



Plurality of embryos has also been observed in 



Rapbanns sativus. *Vi8cum album ! 



Citrus Aurantium ! Daucus Carota. 



Diosma, sp. Ardisia st'rrulata I 



Hypericum perforatum. Cynanchum niginim. 



Triphasia aurantiaca. fuscatum. 



-ffisculus Hippocastanum ! Euphorbia rosea. 



Euonymus latifolius. Ccelebogyne ilicifolia. 



Mangifera indica ! Allium fi*agrans. 



Eugenia Jambos. Funckia, sp. 



Am^gdalus yulgaris ! Carex mantima. 



Vicia, sp. Zea Mays. 



Cassia, sp. 



' See also Reinwardt, * Nov. Act. Acad. Nat. Cur..' 12. 1, 37 ; and 

 Masters, ''Joum. Linn. Soc.,' vi, p. 24. 



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