in South Australia; Beechworth, Arena and
Melbourne in Victoria; Freemantle and Nullagine in Western Australia;
the Palmer and Gilbert rivers in Queensland. These have been for the
most part discoveries in alluvial deposits of the goldfields, and the
stones were small. In Tasmania also diamonds have been found in the
Corinna goldfields. Europe has produced few diamonds. Humboldt
searched for them in the Urals on account of the similarity of the
gold and platinum deposits to those of Brazil, and small diamonds were
ultimately found (1829) in the gold washings of Bissersk, and later at
Ekaterinburg and other spots in the Urals. In Lapland they have been
found in the sands of the Pasevig river. Siberia has yielded isolated
diamonds from the gold washings of Yenisei. In North America a few
small stones have been found in alluvial deposits, mostly auriferous,
in Georgia, N. and S. Carolina, Kentucky, Virginia, Tennessee,
Wisconsin, California, Oregon and Indiana. A crystal weighing 23-3/4
carats was found in Virginia in 1855, and one of 21-1/4 carats in
Wisconsin in 1886. In 1906 a number of small diamonds were discovered
in an altered peridotite somewhat resembling the S. African blue
ground, at Murfreesboro, Pike county, Arkansas. Considerable interest
attaches to the diamonds found in Wisconsin, Michigan and Ohio near
the Great Lakes, for they are here found in the terminal moraines of
the great glacial sheet which is supposed to have spread southwards
from the region of Hudson Bay; several of the drift minerals of the
diamantiferous region of Indiana have been identified as probably of
Canadian origin; no diamonds have however yet been found in the
intervening country of Ontario. A rock similar to the blue ground of
Kimberley has been found in the states of Kentucky and New York. The
occurrence of diamond in meteorites is described below.

_Origin of the Diamond in Nature._--It appears from the foregoing
account that at most localities the diamond is found in alluvial
deposits probably far from the place where it originated. The minerals
associated with it do not afford much clue to the original conditions;
they are mostly heavy minerals derived from the neighbouring rocks, in
which the diamond itself has not been observed. Among the commonest
associates of the diamond are quartz, topaz, tourmaline, rutile,
zircon, magnetite, garnet, spinel and other mi