1 84 The Americaii Geologist. March, issy 
the gravel mills, for he has frequently examined the concen- 
trates of the mills and foimd in them fragments of diamonds 
often so small that they could be determined only by the aid 
of the microscope. Still more recently (1898) Kimble reports 
having examined a diamond found within the limits of the 
town of Placerville. in Cedar ravine, a tributary of Hangtown 
creek. 
Mr. J. A. Edman in a letter reports two localities of dia- 
monds in Plumas county. He found a few in the black sands 
of Gopher hill, the largest one being 1-20 of an inch in dia- 
meter, and on upper Spanish creek in a sand rich in heavy 
minerals he found two. The Gopher hill locality is in 
Sec. 7, T. 24 N, range 9 E, and the Spanish creek locality is 
Sec. 10, T. 24 N, range 8 E, Mt. Diablo meridian. 
Mr. George F. Kunz''' refers to the finding of two diamonds 
recently by W. P. Carpenter near Placerville, the larger one 
of a gfee:: sh shade and the smaller pale yellowish, and each 
nearly '4 of ^'i hich in diameter. Mr. Carpenter proposes to 
work his section of the channel by other means and avoid the 
possible loss of diamonds of more value than the gold. The 
same writert notes the finding of a small diamond on the banks 
of Alpine creek in Tulare county, California, by L. W. Haw- 
kins, and of five diamonds near C)roville in Butte county, 
and as many more at another locality, suggesting a peridotytc 
origin. In a later reportt Mr. Kunz quotes from a writer 
in the Engineering and Mining Journal, who gives a descrip- 
tion of a sim.'ple outfit for a miner or prospector looking for 
diamonds in placers: 
A light pick, a shovel, a "miner's wallet," or long bag for carrying 
the gravel, etc., to water (size 4 feet 8 inches long by a foot and a 
half across), and two screens or "riddles" with meshes of three-fourths 
and one-eighth inch, respectively, together with a tub for washing, 
easily made by cutting a barrel in half, or else a rubber bath tub, and 
a sheet of rubber cloth to sort the washed gravel upon. To cxamiti'.: 
it he should have a watchmaker's lens (two powers) and a hardness 
scale, made by fixing a chip of diamond, one of corundum, and one of 
quartz, with a lapidary's cement, into the end of a piece of glass tubing 
or of a pencil from which the rubber has been removed. The lapidary'^ 
*i6th Ann. Rep. U. S. G. S. Part IV. p. 596. 
ti7th Ann. Rep. U. S. G. S. Part III. p. 896. 
+i8th Ann. Rep. U. S. G. S. Part V. p 1189. 
