According to his experience, the place to look for gold is in the neighbourhood of distinct traces of volcanic action, or in small streams coming direct from hills of volcanic formation, or rivers fed by these streams. An abundance of quartz (commonly called spar) is universally reckoned an indication of the presence of gold; and if trap-rock is found cropping up amid this quartz, and perforated with streaks of it, so much the better. Sometimes the solid quartz itself is pounded, and gold extracted by the aid of quicksilver. When the gold is found in rivers, or on their banks, prediction is vain: nothing will do but the actual trial by the wash-pan. But where there is a bar or sand-bank, the richest deposit will always be on the side of the bank presented to the descending stream. The metal in such digging is almost invariably found in small spangles, that appear to have been granular particles crushed or rolled flat by some enormous pressure. In California, these spangles were the beginning of the gold-finding. When the streams and their banks were well searched, the crowds of adventurers tried, in desperation, what they could do by digging deep holes in the plains; and there the metal was found in such different forms as to indicate quite a different process of deposition. Some of these holes were productive--although it was severe labour to dig fifteen or eighteen feet through a hard soil merely as an experiment; and in the course of time the plains were covered with tents. The influx of adventurers continued; and the old diggers, dissatisfied with gains that seemed to the new prodigious, retired further and further back, and began to grope in the terraces on the sides of volcanic hills, and among the detritus of extinct craters. Here the harvest was rich, and as the crowning effort of the gold-passion, unassisted by machinery, they actually in some cases cut away the sides of the hills! 'My own impression is,' concludes our informant on this subject, 'that, both in California and Australia, the chances of individual enterprise, and even of small companies, are decreasing rapidly; but that when the mines so wrought have ceased to pay, capital and machinery, directed by science, will receive profitable employment for ages to come.'