[ 45 1 !

z. There were some rough yellow particles, very mal-leable, which appeared to be gold, though not free froma mixture of platina. A further examination of thesegolden particles will be given hereafter. Their quantitydiffers in different parcels of the mineral: twelve ouncesof the richest that has come to my hands being diligentlypicked, with the assistance of a magnifying glass, thegrains partly or entirely yellow amounted to about twopennyweights, or one part on a hundred and twenty ofthe mixt.

4. A few globules of quicksilver containing gold, withsome particles of platina intermixed and pretty stronglyadhering. Mr. Marggraf likewise observed some quick-silver among the platina which he examined, having beeninduced to look for it with attention, by finding, that whenan ounce of platina had been urged with a strong fire in aglass retort, a little true running mercury came over intothe receiver. The yielding of quicksilver and containingsome magnetic parts, the former of which is particularlymentioned in the first of my papers in the PhilosophicalTransactions, and the latter not only there, but by all■those I know of who have given any experimental account</f platina, are ranked by Vogel among the new propertiesof this mineral discovered by Marggraf.

5. Some fine colourless transparent particles,which werehard to break under the hammer, and were not sensiblyacted upon by aquafortis. These are probably fragmentsof the hard kind of stone, which frequently invests ores inmines, and in which native gold is oftenest found lodged,called by the Germans quartz , but which has not, that Iknow of, received any distinctive English name.

6. A very few irregular particles of a jet black colour.These broke very easily, and looked like the finer sorts of

N n n pitcoal i