inner (London, 1891); Constance F. Gordon Gumming, _Two
Happy Years in Ceylon_ (2 vols., Edinburgh, 1892); H.W. Cave, _The
Ruined Cities of Ceylon_ (London, 1897), and _The Book of Ceylon_
(London, 1908); Sir Emerson Tennent, _Ceylon_ (2 vols. 4th ed., 1860);
J. Ferguson, _Ceylon in 1903_ (Colombo); J.C. Willis, _Ceylon_
(Colombo, 1907). See also E. Muller, _Ancient Inscriptions in Ceylon_,
published for the government (1883-1884), and the important
archaeological survey in _Epigraphia Zeylonica_, part i., 1904, ii.,
1907, iii., 1907, by Don Martino de Silva Wickremasinghe, who in 1899
was appointed epigraphist to the Ceylon government. Among other works
on special subjects may be mentioned H. Trimen, F.R.S., director of
Ceylon Botanic Gardens, _Ceylon Flora_, in 5 vols., completed by Sir
Joseph Hooker; Captain V. Legge, F.Z.S., _History of the Birds of
Ceylon_ (London, 1870); Dr Copleston, bishop of Colombo, _Buddhism,
Primitive and Present, in Magadha and in Ceylon_ (London, 1892);
review by Sir West Ridgeway, _Administration of Ceylon, 1896-1903_;
Professor W.A. Herdman, _Report on the Pearl Oyster Fisheries,
1903-1904_.

CHABAZITE, a mineral species belonging to the group of zeolites. It
occurs as white to flesh-red crystals which vary from transparent to
translucent and have a vitreous lustre. The crystals are rhombohedral,
and the predominating form is often a rhombohedron (r) with interfacial
angles of 85 deg. 14'; they therefore closely resemble cubes in
appearance, and the mineral was in fact early (in 1772) described as a
cubic zeolite. A characteristic feature is the twinning, the crystals
being frequently interpenetration twins with the principal axis as
twin-axis (figs, 1, 2). The appearance shown in fig. 1, with the corners
of small crystals in twinned position projecting from the faces r of the
main crystal, is especially characteristic of chabazite. Such groups
resemble the interpenetrating twinned cubes of fluorspar, but the two
minerals are readily distinguished by their cleavage, fluorspar having a
perfect octahedral cleavage truncating the corners of the cube, whilst
in chabazite there are less distinct cleavages parallel to the
rhombohedral (cube-like) faces. Another type of twinned crystal is
represented in fig. 2, in which the predominating form is an obtuse
hexagonal pyramid (t); the faces of these flatter crystals are often
rounded, giving rise to lenticul