144 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
as in the Gilman Flint, and the kernels being much larger. This hybrid 
ripened nearly as early as the Gilman Flint, being secure from injury by 
frost three months after it was planted. 
It is the intention of the Department to test such hybrids in the 
regions to which they seem best adapted, and to fix races of such as are 
found valuable. 
CONCLUSION. 
What has been said above will serve to show the character of the 
work on plant breeding, which it is the intention of the Department of 
Agriculture to foster, and also to call attention to some of the important 
problems which are now receiving attention. The vast diversity of soil 
and climatic conditions afforded by our great extent of territory renders 
it necessary for us to have very many different sorts of cultivated plants. 
An important and almost illimitable field is thus opened for the plant 
breeder, and we hope that the work on this subject in the Department of 
Agriculture may soon assume such scope and magnitude as its importance 
demands. 
EXPLANATION OF FIGURES. 
Fig. 42.—Citrus hybrids, showing comparative vigour: 772, hybrid of 
Citrus trifoliatag x C. aurantium sinensis $, a medium-sized seedling 
selected from nine hybrids of same parentage ; 780, type of female parent 
(C. trifoliata), one of the largest of thirty seedlings; 845, type of male 
parent (C. awrantiwm sinensis), one of the largest of nearly five hundred 
seedlings. These three seedlings are all of the same age. 
Fig. 48.—True and false citrous hybrids: No. 1, false hybrids of 
C. trifoliata? x C. aurantiwm sinensis $ from same seed, both hybrids 
resembling the female parent only; No. 2, three, hybrids of Tangerine 
Orange (C. nobilis)@ x C. trifoliatag from one seed, the largest, with 
trifoliolate leaves, being a true hybrid, while the two small ones, resembling 
the female parent only, are false hybrids; No. 3, two hybrids of C. tri- 
foliata? x C. aurantium sinensis 8, both from same seed, the one on 
the left, with large leaves, being a true hybrid, and the one on the right, 
with small leaves, being a false hybrid ; No. 4, two false hybrids of 
C. trifoliata? x C.aurantium sinensis g , both from same seed, resembling 
female parent only. 
Fig. 44.—True and false hybrids from same fruit of C. trifoliata? x 
C. aurantium sinensis $, showing comparative size. Upper row true 
hybrids, lower row false hybrids. 
Fig. 45.—Hybrids of Sandford’s Mediterranean (C. awrantiwm sinen- 
sis)? x C. trifoliatad. Trifoliolate seedlings in pots Nos. 1 and 2 are 
true hybrids, being intermediate between the two parents; the others are 
apparently false hybrids, resembling the female parent only. 
Fig. 46.—Leaves of true and false citrous hybrids: 715 and 716, 
false and true hybrids respectively of Sweet Orange (C. awrantium)2 x 
C. trifoliatag ; 778 and 745, false hybrids of C. trifoliata? x C. awran- 
tium sinensis & ; 772 and 777, true hybrids of C. trifolatag x C. awran- 
tium sinensis. 
Fig. 47.—Hybrids of Ruby Orange (Citrus awrantiwm sinensis)? Xx 
Tangerine (C. nobilis) é: No. 1, seedling resembling female parent; No. 2, 
