284 Scientifie Intelligence. 
Enormous amounts of gold have been taken from some of these 
rounded alluvial hills. The yield, however, is not so uniform as in the 
the rock, small lumps or nuggets of gold will sometimes slip down 
between the vertical slates, 
In concldsion, the methods of separating the gold from the gravels 
and clays are the same as those used elsewhere in New South Wales 
and California, and vary of course according to the means at the com- 
mand of the miners*. - 
. On the Structure of Agate ; by Tueopore Gimpst, (Leonhard 
u. Bronn’s N. Jahrb. f. Min., 1853, pp- 152-157; Quart. Jour. Geol. 
-» Ix, 259.)—The curious and beautiful appearances afforded by 
agates have long made them of pri ary importance in mineralogi- 
Zimmerman is the first, to my knowledge, who observed? that the dif- 
ferent varieties of quartz—as amethyst, calcedony, carnelian, age 
posed of layers of diverse character ; secondly, that towards the centre 
of the nodule is a large mass of amethystine quartz, the nuéleus of the 
latter again being formed of very small concentric spherules. 
In the Jahrbuch fiir Praktische Pharmacie, Sc. 1852, isa short paper 
not homogeneous, but consists of lamellee overlying one another ce 
varying angles and confusedly distorted. As in the thin pellicle of 
blown glass the intimate structure of the soap bubble is as it were fixed, 
so I sought to make further researches by means, of experiments 00 
molecular movement, such as can be observed in so many instances. 
One of the most successful experiments was the use of melted stearie 
with which very fine graphite had been mixed, spangles of which easily 
* Besides the Ballarat and Mount Alexander gold-fields, “diggings 
d on ne Moorabool 
» have been 
op rat; on the 
Plenty and Yarra Yarra Rivers, N. E. 0 Melbourne; on the Mitta Mitta River v3 
Lake Omeo, in the N. E, part of the Colony ; as well as at several points along 
eastern portion of the Boundary-line between Victoria and New South Wales. 
+ In his Taschenbuch far Min ogie. 
¢ See also Mr. Hamilton’s Paper on the Agate Quarries of Oberstein, Quart. 
Geol. Soc., vol. iv, p. 215.—Tranal. § Vol. ii. No. 2, p. 124 
a * 
ened at Mount Blackwood an River, near Balla 
