8364 RESUME AND THEORETICAL DISCUSSION. 
perfect crystal, though covered with a white coating which destroys its 
lustre. The surface is somewhat rough, under my pocket magnifying-glass, 
and the crystal in its present condition is but slightly translucent, not trans- 
parent, and has the common very slightly yellowish tinge of Californian 
diamonds, and probably one or two small flaws. It probably weighs not far 
from one and a half carats.” In the same neighborhood, at Smith’s Flat, 
Mr. Goodyear heard of two or three other probable diamonds as having been 
found there, and adds, “I have little doubt that a good many have been 
picked up here, and looked at and thrown away.” 
There are said to have been three or four diamonds found at the mines at 
and about White Rock. Mr. Goodyear purchased at that place, of Mr. Potts, 
a perfect crystal, having a very slight yellow tinge, and weighing half a 
carat. It was found in washing the gravel, which came from a tunnel driven 
into the White Rock Ridge. Near the same place three diamonds were found 
in the gravel, by the Ward Brothers, in 1867. The largest of them is said to 
have been valued at $ 50 by a dealer in San Francisco. 
Other localities are: Jackass Gulch, near Voleano; Indian Gulch; Loafer 
Hill, near Fiddletown, from which vicinity quite a number have been 
reported at different times. 
French Corral, in Nevada County, has also produced quite a number of 
diamonds; the largest Californian specimen which the present writer ever 
saw was said to have been from this locality ; it weighed seven grains and a 
quarter. Others have been reported, one of which is said to have weighed 
a trifle over five grains. 
At Cherokee Flat, in Butte County, Professor Pettee was informed that 
fifty-six diamonds had been picked out from the washings, at various times, 
and that one of these had an estimated value of $250. 
Microscopic diamonds were discovered in 1869, by Wéhler, in gold wash- 
ings from Oregon.* Associated with the diamond were platinum, laurite, 
iridosmine, chromic iron, and zircon. Similar finds have been made in north- 
ern California, in connection with black iron sands from the sea-beach. As 
in the case of the Oregon specimen examined by Wohler, which was prob- 
ably from a similar locality, the microscopic diamonds appear to be always 
associated with platinum. ; 
Next to the diamond, perhaps platinum and the allied and associated min- 
erals are of the greatest interest as accompaniments of the gold in California. 
* American Journal of Science (2) XLVIII. p. 441. 
