had in 1907-1908 20 instructors, 178 students, and a
library of 47,000 volumes and 30,000 pamphlets. At Clinton are also
excellent minor schools. Litchfield Observatory is connected with the
college, and was long in charge of the well-known astronomer, Christian
H. F. Peters (1813-1890), who discovered here more than 40 asteroids and
made extensive investigations concerning comets. The village was settled
about 1786 by pioneers from New England, was named in honour of George
Clinton, and was incorporated in 1842.

CLINTONITE, a group of micaceous minerals known as the "brittle micas."
Like the micas and chlorites, they are monoclinic in crystallization and
have a perfect cleavage parallel to the flat surface of the plates or
scales, but differ markedly from these in the brittleness of the
laminae; they are also considerably harder, the hardness of chloritoid
being as high as 6-1/2 on Mohs' scale. They differ chemically from the
micas in containing less silica and no alkalis, and from the chlorites
in containing much less water; in many respects they are intermediate
between the micas and chlorites.

The following species are distinguished:--

_Margarite_ is a basic calcium aluminium silicate, H2CaAl4Si2O12, and is
classed by some authors as a lime-mica. It forms white pearly scales,
and was at first known as pearl-mica and afterwards as margarite, from
[Greek: margarites], a pearl. It is a characteristic associate of
corundum, of which it is frequently an alteration product (facts which
suggested the synonymous names corundellite and emerylite), and is found
in the emery deposits of Asia Minor and the Grecian Archipelago, and
with corundum at several localities in the United States.

_Seybertite_, _Brandisite_ and _Xanthophyllite_ are closely allied
species consisting of basic magnesium, calcium and aluminium silicate,
and have been regarded as isomorphous mixtures of a silicate
(H2CaMg4Si3O12) and an aluminate (H2CaMgAl6O12). Seybertite (the
original clintonite) occurs as reddish-brown to copper-red, brittle,
foliated masses in metamorphic limestone at Amity, New York; brandisite
as yellowish-green hexagonal prisms in metamorphic limestone in the
Fassathal, Tirol; xanthophyllite as yellow folia and as distinct
crystals (waluewite) in chloritic schists in the Urals.

_Chloritoid_ has the formula H2(Fe,Mg)Al2SiO7. It forms tabular crystals
and scales, with indistinct hexagonal outlines, which are often curved