Our slates in Victoria are elongated, amorphous, crystalline, contorted, laminated, with or without cleavage, red, brown, white, blue, and chocolate color. Some are very talcose and soapy. In others grains or streaks like rainbows are seen. Mundic or Iron pyrites’ crystals are found in dark, friable, unctious slate of Forest creek. At Miles’ creek, Bendigo, are fine curvillinial lines in red slates. Near the old square, Forest creek, and beside Fryer’s creek is some splendid blue book slate, resembling the leaves of a book. The cleavage of the slates is evidently made by magnetic agency. Sometimes, as at Bendigo, the cleavage planes preserve a true parallelism while passing through contorted hard slate. 3. The rocks of the diggings are observed in successive bands of various colors and compositions with a great vertical inclination. This is the same as in other gold countries. Intelligent miners are much struck with this fact of rock succeeding rock over a country side by side, and all with a perpendicular direction. The slate has some odd changes of position, influenced doubtless by local disturbances. On the road from Bendigo to Bullock creek, the rock may be seen in one place dipping 80° to the east, a little further 80° to the west, then 10° to the west, &c. In Iron bark gully I noticed in a square yard of space the following different position, in some blue roofing slate; 45° to N E, 30° to Es 70° to N. The Pipe clay, which, being silicate of alumina, is decomposed from siliceous slates and granites, has, like the neighbouring rocks, this same vertical inclination. 4. The ridges of rocks are observed to run nearly in a North and South direction. This is the same as in all gold countries, and establishes the theory of terrestrial magnetic agency. 5. There is a remarkable abundance of iron. Crystals of iron pyrites are common. The carburet of iron or emery, like iron sand, is always associated with gold. Oxydulous masses of iron form a precipitous waterfall of 60 feet near Oaky Creek, New South Wales. Ferruginous, or iron bearing, conglomerate, overhangs the river at Ophir. Auriferous bands of argillaceous iron ore traverse the limestone of Bungonia. Large nodules of peroxide of iron, and magnetic iron ore of all kinds, are taken out of our Victoria Diggings. The burnt stuff, or burnt quartz of the miners, is a ferruginous cement binding quartz pebbles. There is no need of referring this compound to volcanic or electric fire. Chemical action with moisture will make any mixture hard enough. Roman cement when dried is not very soft. In the Ballarat holes the “Burnt Quartz” has been found ten feet thick; it is less at the Mount, and less still at Bendigo, though on some Bendigo hills it occurs six or eight feet.