182 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
dug up the seed and found them still connected with the cotyledons and 
all encased in the same seed coat. The same precaution was taken in 
another similar case, and the fact of the occurrence of such cases, is 
beyond a question of doubt, whatever be the interpretation. There can 
be but little doubt that here the trifoliolate seedling comes from the 
embryo developing from the ege cell proper, and shows the effect of the 
hybridisation, while the other two seedlings resembling the Tangerine 
mother plant are from adventive embryos. It should also be noticed 
that the leaves of the trifoliolate seedling are much larger than those 
of typical trifoliata, as is plainly shown by a comparison with a 
Fic. 43.—TrRurE anp Fatsre Crrrous Hysrips. 
trifohata seedling shown in fig. 43, No.1. A similar case, of different 
parentage, is shown in fig. 43, No. 3. The seed of No. 3 was the result of a 
cross made by Mr. Swingle of trifoliata with pollen of the Sweet Orange. 
Here the seedling with large leaves is doubtless from the embryo affected 
by the hybridisation, while that with fewer and smaller leaves resembling 
true trifoliata (in this case the mother parent) is doubtless from an 
adventive embryo. The reciprocal hybrids of the above, when the 
Sweet Orange is used as the mother parent and the ¢trifoliata as the 
father parent, several of which have been secured, frequently exhibit the 
same phenomenon (see fig. 45, No. 1). Similar cases have occurred 
among our hybrids of Orange and Pomelo, and Orange and Tangerine. 
