EMBRYOS. 369 
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 1s commonly made for more; and, indeed, 
mn certain natural orders. plurality of embryos in the 
same seed does occur, as in Cycadew and Conifere. In 
the seeds of the orange (Citrus), in those of some Huphor- 
biacee, &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. Mr. Parish, of Moulmein.! 
Plurality of embryos has also been observed in— 
Raphanus sativus. *Viscum album ! 
*Citrus Aurantium ! Daucus Carota. 
Diosma, sp. Ardisia serrulata ! 
Hypericum perforatum. Cynanchum nigrum. 
Triphasia aurantiaca. fuscatum. 
* Asculys Hippocastanum ! Euphorbia rosea. 
Euonymus latifolius. Ceelebogyne ilicifolia. 
*Mangifera indica! Allium fragrans. 
Eugenia Jambos. Funckia, sp. 
Amygdalus vulgaris! Carex maritima. 
Vicia, sp. Zea Mays. 
Cassia, sp. 

1 See also Reinwardt, ‘Nov. Act. Acad. Nat. Cur.,’? 12, 1,37; and 
Masters, ‘Journ. Linn. Soc.,’ vi, p. 24. 
24, 
