The physical conditions under which gold occurs are extremely variable. Popularly speaking, the most familiar form is the 'nugget,' or shapeless mass of appreciable size. These, however, constitute in the aggregate but a small proportion of the gold yielded by any field, and were much more common in the early days of placer-mining in California and Australia than they are now. One of the largest ever found, the 'Welcome' nugget, discovered in 1858 at Bakery Hill, Ballarat, weighed 2217 ounces 16 dwt., and sold for £10,500, whilst not a few have exceeded 1000 ounces. One found at Casson Hill, Calaveras county, California, in 1854, weighed 180 pounds. The 'Water Moon' nugget, found in Australia in 1852, weighed 223 pounds. The origin of these large nuggets has been a subject for discussion. Like all placer or alluvial gold, they have been in part at least derived from the auriferous veins traversing the rocks whose disintegration furnished the material forming the gravel beds in which the nuggets are found. The famous nugget known as the 'Welcome Stranger' was discovered under singular circumstances in the Dunolly district of Victoria, which is one hundred and ten miles north-west of the capital, Melbourne, by two Cornish miners named Deeson and Oates. Their career is remarkable, as showing how fortune, after frowning for years, will suddenly smile on the objects of her apparent aversion. These two Cornishmen emigrated from England to Australia by the same vessel in 1854. They betook themselves to the far-famed Sandhurst Gold-field in Victoria; they worked together industriously for years, and yet only contrived to make a bare livelihood by their exertions. Thinking that change of place might possibly mean change of luck, they moved to the Dunolly Gold-field, and their spirits were considerably raised by the discovery of some small nuggets. But this was only a momentary gleam of sunshine, for their former ill-luck pursued them again, and pursued them even more relentlessly than before.