WORK OF THE UNITED STATES DEPARTMENT, &c. i15}3) 
Ali of the forty hybrids of the Trifoliate Orange crossed with Sweet 
Orange mentioned above were from a single fruit. In the case of the 
eleven seedlings which plainly show intermediate characters there can 
be but little doubt but that they are all from embryos developed from 
egg cells proper, and thus true hybrids. In the case of the twenty-nine 
hybrids which show no effect of the male parent itis very doubtful whether 
they may not be developments from adventive embryos. It seems prob- 
aye - hig 
| oe oe be eo 
2 t a 
SRE ANIM ST te NN RO I TY STP 
ee 
RS ee: ee esi 
sisi ta 2b 
= 
SLAB Oh 
, on im | ,=, 2,2 elm, mi) =) 
ee 
Fig. 44.—Trvur anp Fausre Hyprivs FRoM THE SAME FRuIT or C. TRIFOLIATA x 
CG. AURANTIUM SINENSIS. 
able that the fecundation of a few seeds of a fruit may stimulate the 
development of other seeds not fecundated, where the only embryos 
formed are developed adventively, and are not affected by the hybridisation 
except indirectly so far as the stimulation to development is concerned. 
In the pots shown in fig. 48, Nos. 1 and 4, two seedlings have developed 
from a single seed in each case, and in neither case do either show any 
effect of having been crossed with the Sweet Orange. Those seedlings 
from hybridised fruits, which show no effect of the male parent, and 
