As is usual in most of the coffee species, caffein is present. The amount appears to be, on an average, somewhat larger (even exceeding 2.0 percent) than in the South American coffee species. In no instance, however, did the amount exceed the maximum limits observed in coffee in general.... Due to its rapid growth, early and prolific yield, resistance to coffee blight, and many other desirable qualities, _Coffea robusta_ has established "its own". In the writers' judgment, _robusta_ coffee deserves consideration and recognition. Among the _robusta_ varieties, _Coffea canephora_ is a distinct species, well characterized by growth, leaves, and berries. The branches are slender and thinner than _robusta_; the leaves are dark green and narrower; the flowers are often tinged with red; the unripe berries are purple, the ripe berries bright red and oblong. The produce is like _robusta_, only the shape of the bean, somewhat narrower and more oblong, makes it look more attractive. _Coffea canephora_, like _C. robusta_, seems better fitted to higher altitudes. Other _canephora_ varieties include: _Madagascar_, having small, slightly striped, bright red berries and small round beans; _Quillouensis_, having dark green foliage and reddish brown young leaves; and, _Stenophylla Paris_, with purplish young berries. These last two named were under test at the Bangelan gardens in 1919. Among other allied _robusta_ species are: _Ugandae_:, whose produce is said to possess a better flavor than _robusta_; _Bukobensis_, different from _Ugandae_ in the color of its berries, which are a dark red; and _Quillou_, having bright red fruit, a copper-colored silver skin, three pounds of fruit producing one pound of market coffee. Some people prefer _Quillou_ to _robusta_ because of the difference in the taste of the roasted bean. _Some Interesting Hybrids_ The most popular hybrid belongs to a crossing of _liberica_ and _arabica_. Cramer states that the beans of this hybrid make an excellent coffee combining the strong taste of the _liberica_ with the fine flavor of the old Government Java _(arabica_), adding: The hybrids are not only of value to the roaster, but also to the planter. They are vigorous trees, practically free from leaf disease; they stand drought well and also heavy rains; they are not particular in regard to shade and upkeep; never fail to give a fair and often a rather heavy crop. The fruit ripens all the year around, and does not fall so easily as in the case of _arabica_. Among other hybrids (many were still under trial in 1919) may be mentioned: _Coffea excelsia x liberica_; _C. Abeokutae x liberica_; _C. Dybowskii x excelsa_; _C. stenophylla x Abeokutae_; _C. congensis x Ugandae_; _C. Ugandae x congensis_; and _C. robusta x Maragogipe_.