One of the chief problems the association wished to solve was that of the exist ence and course of the river Niger, which was believed by some authorities to be identical with the Congo.

The ence of the Church thus escaped the unpopularity of this decadent empire, and during the 5th century she provided a refuge for all those who, wishing to preserve the Roman unity, were terrified by the blackness of the horizon.

The process is the same as that of finding the sum or differ I ence of 3 sixpences and 5 fourpences; we cannot subtract 3 sixpenny-bits from 5 fourpenny-bits, but we can express each as an equivalent number of Ones.

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The conformation of those flowers a consists essentially in the pres- ' 'A B ence of a six-parted perianth, the three outer segments of which correspond to a calyx, the three inner ones to a corolla.