1.

 Captain J. A. Sutter.

2.

 John Sinclair.

3.

 Wm. Glover, R. C. Kirby, Ira Blanchard, Levi Fifield, Franklin H. Arynes, Mormon diggings.

4.

 Charles Weber.

5.

 Robert Spence.

6.

 Sunol & Co.

7.

 Robert D. Neligh.

8.

 C. E. Picket, American Fort Columa.

9.

 E. C. Kemble.

10.

 T. H. Green, from San Fernando, near Los Angelos.

A. 2 oz. purchased from Mr. Neligh.

B. Sand found in washing gold, which contains small particles.

11.

 Captain Frisbie, Dry Diggings, Weber's Creek.

12.

 Consumnes.

13.

 Consumnes, Hartwell's Ranch.

I have the honor to be your most ob't ser't,
R. B. MASON, Col. 1st Dragoons, Commanding.
Brig. Gen. R. JONES, Adj. Gen. U. S. A., Washington, D. C.

[NOTE.--The original letter, of which this is a copy, was sent to its address, in charge of Lieut. L. Loeser, 3d Artillery, bearer of dispatches, who sailed in the schooner Lambayecana, from Monterey, Aug. 30, 1848, bound for Payta, Peru. Lieut. Loeser bears, in addition to the specimens mentioned in the foregoing letter, a tea-caddy containing two hundred and thirty ounces fifteen pennyweights and nine grains of gold. This was purchased at San Francisco by my order, and is sent to you as a fair sample of the gold obtained from the mines of the Sacramento. It is a mixture, coming from the various parts of the gold district.

R. B. MASON, Col. 1st Drag. Comd'g. HEADQUARTERS 10TH MIL. DEPARTMENT, Monterey, (Cal.,) Sept. 10th, 1848.]

PURITY OF CALIFORNIA GOLD DUST.

The numerous analyses which have been made show that the gold dust of California is remarkably pure. The editor of the Buffalo Commercial Advertiser, under date of December 20th, 1848, says:--

"A small quantity of California gold was shown us this morning. It was in grains, about the size and shape of flax seed. Altogether there was half an ounce. It was received by a gentleman of this city, who, last year, left a quantity of goods in California for sale on commission. A few days ago he received advices that his goods had been sold, and the proceeds remitted in gold dust to New York. The receipts from the mint show its great purity. The weight before melting was 428 ounces; after melting 417. Nett value, $7,685.49."

Gold is seldom found, in any parts of the earth, more than 22 carats fine: and it will be seen by the following report lately made by an experienced smelter and refiner, Mr. John Warwick, of New York city, that the gold dust of California is as pure as that found in any part of this country. Probably there is none in Europe purer:

"I have assayed the portion of gold dust, or metal, from California, sent me, and the result shows that it is fully equal to any found in our Southern gold mines.