nity College,
Cambridge, where he took mathematical and classical honours, he became
an active journalist, contributing largely to the principal reviews. He
was called to the bar in 1875, became a bencher of Gray's Inn in 1896,
and was treasurer in 1903-1904. He was connected with the _Daily
Telegraph_ as leader writer and then as special correspondent, and after
a short spell in 1870 as editor of the _Daily News_ he became editor of
the _Observer_, a position which he held until 1889. Of his many books
on foreign affairs perhaps the most important are his _England and
Egypt_ (1884), _Bulgaria, the Peasant State_ (1895), _The Story of the
Khedivate_ (1902), and _The Egypt of the Future_ (1907). He was created
C.B. in 1886.

His brother ALBERT VENN DICEY (b. 1835), English jurist, was educated at
Balliol College, Oxford, where he took a first class in the classical
schools in 1858. He was called to the bar at the Inner Temple in 1863.
He held fellowships successively at Balliol, Trinity and All Souls', and
from 1882 to 1909 was Vinerian professor of law. He became Q.C. in 1890.
His chief works are the _Introduction to the Study of the Law of the
Constitution_ (1885, 6th ed. 1902), which ranks as a standard work on
the subject; _England's Case against Home Rule_ (1886); _A Digest of the
Law of England with Reference to the Conflict of Laws_ (1896), and
_Lectures on the Relation between Law and Public Opinion in England
during the 19th century_ (1905).

DICHOTOMY (Gr. [Greek: dicha], apart, [Greek: temnein], to cut),
literally a cutting asunder, the technical term for a form of logical
division, consisting in the separation of a genus into two species, one
of which has and the other has not, a certain quality or attribute. Thus
men may be thus divided into white men, and men who are not white; each
of these may be subdivided similarly. On the principle of contradiction
this division is both exhaustive and exclusive; there can be no
overlapping, and no members of the original genus or the lower groups
are omitted. This method of classification, though formally accurate,
has slight value in the exact sciences, partly because at every step one
of the two groups is merely negatively characterized and therefore
incapable of real subdivision; it is useful, however, in setting forth
clearly the gradual descent from the most inclusive genus (_summum
genus_) through species to the lowest class (_infima species_), which is
d