248 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
now on questions of heredity. Peculiarities of structure, and equally, it 
seems, of function, are not readily lost, but may.persist, in a gradually 
reduced state, in several succeeding generations. 
A glance at the comparative results, however, equally demonstrates 
that in this, as in some other hybrids studied, certain parts or organs 
tend more toward one parent than another. The balance of development 
throughout in the present case is evidently toward D. intermedia. Thus, 
in the relative size of the tentacular hair heads, in the amount of thicken- 
ing of the indurated cortex cells, in the greatly reduced size of the 
glandular hairs of the sepals as inherited from D. filiformis, and in the 
colour and size of the flowers, there is a decided preponderance in 
morphological detail of D. intermedia over the other parent, or the former 
exercises a certain swamping effect on the growth vigour handed down 
from the latter parent. This is all the more remarkable when one 
considers that the apparently prepotent parent is the smaller and more 
delicate species. Until facts can be obtained on which to base an exact 
explanation we can at best merely theorise. But I would again advance 
as a highly probable hypothesis the view given in my earlier paper, viz. 
that the sex cells of the pollen grain or of the ovule may have attained 
to a greater size in the smaller species, and may have contained a larger 
amount of hereditary chromatic substance. In the graft hybrid Cytisuws 
Adami admirable and direct evidence is afforded of a much smaller species, 
Cytisus purpureus, having greatly larger nuclei and more chromatin 
apparently in its epidermal cells than the larger species, C. Laburnum, 
which has contributed with it to the formation of the graft hybrid. The 
graft hybrid itself closely resembles the smaller species in the size, appear- 
ance, and relation to stains of its epidermal nuclei, not to mention other 
and more evident characters. A like condition may exist in the hybrid 
and parent forms of Drosera, even though scarcely, if at all, discernible 
under the microscope. It is hoped that a careful study can yet be made 
of this feature with the material now under cultivation. 
The phenomenon which the writer termed bisexual hybridity receives 
several striking exemplifications. Where two more or less diverse growths 
have occurred, one on either parent, these have been shown to be repro- 
duced, notin blended fashion, but as distinct structures reduced either in 
size or number, or both. The elongated glandular hairs on the sepals of 
D. filiformis and the sessile two-celled glands of D. intermedia alike 
appear in the hybrid. Sucha morphological pattern is frequent in hybrids 
whose parents are somewhat removed in systematic affinity, and suggests 
interesting cytological speculation. For, if every cell in the hybrid be, 
as its structure proclaims it to be, a combined effect of two parental condi- 
tions, each reduced by half, some appropriate explanation must be given to 
the special case before us. As yet we have no evidence which would 
militate against the view, and everything is in favour of it, that every 
a erage cell of a hybrid has an equal number of chromosomes and half 
as much chromatic substance as is found in each parent. But for the 
production of two such epidermal appendages some special line of deve- 
lopment must have been taken by the epidermal cell which gave rise to 
each. The view would be an imperfect one which would cause us to 
suppose that chromosomes representative of one parent were alone present 
