WORK OF THE UNITED STATES DEPARTMENT, Kc. 135 
trifoliolate leaves, somewhat larger than the normal leaves of trifoliata, 
clearly showing the influence of the pollen parent. It is interesting to 
note here also that the trifoliolate seedling is the largest of the series. 
Loose Skin of Mandarin.—A second improvement of importance 
which it is desired to produce is a fruit having the quality and flavour of 
the finest varieties of the Common Orange with the loose, easily removable 
skin of the Mandarin type of Orange (C. nobilis). With this object in 
view a number of hybrids have been made, principally between the 
Tangerine, the best sort of Mandarin Orange in cultivation, and various 
varieties of the Common Orange. Citrus nobilis is much more closely 
related to the Common Orange than the C. trifoliata, and the hybrids 
seem to be much more variable in the first generation, some very closely 
resembling the parents, while others are apparently intermediate as far 
Fic. 45.—Hysrivs or Sanprorp’s MEDITERRANEAN (C. AURANTIUM SINENSIS) x 
C. TRIFOLIATA. 
as can be judged from foliage characters. Here, however, the characters 
of the parents are more nearly alike, and it is only in the extreme varia- 
tions that the foliage resemblances can be clearly distinguished. In 
almost every case, however, the great majority of the seedlings resemble 
the mother parent in the main, while comparatively few show plainly 
the effect of the male parent. Among 286 hybrids of the Tangerine 
crossed with pollen of Common Orange 247 seemed mainly to resemble 
the Tangerine in foliage characters, while thirty-nine show more 
resemblance to the Common Orange. 
The reciprocal hybrids, where the Common Orange was crossed with 
pollen of Tangerine, show the same features, the majority of the seed- 
lings resembling the mother parent, and only a small percentage of them 
showing the effect of the male parent. In fig. 47, showing seven 
seedlings of the Ruby Orange 2 x Tangerine ¢ , the large seedlings in Nos. 1 
