suitable for legislation, and can only be settled through the indirect action of public opinion on the shopkeeper himself. =The Occurrence of Gold Ores.=--The following paragraphs are from an article by H. M. Chance in the Engineering Magazine for July, entitled The Increasing Production of Gold: "Another reason for anticipating further increase in the production of gold is found in our better knowledge of gold ores, and of the conditions under which gold occurs in Nature. Until the discovery of the Cripple Creek district the occurrence of gold as tellurid in deposits of large extent and value was practically unknown. Gold was, of course, known to occur, sparingly in some ores, partially as a tellurid associated with other minerals; but such a mineralized belt as that at Cripple Creek was entirely unknown, and such deposits were not looked for by the prospector. Similarly, we now know of another class of gold ores in which the gold occurs apparently in some form chemically combined in a siliceous matrix, often approaching a true jasper or hornstone, and showing by analysis possibly ninety-five per cent of silica. Such ores show no trace of 'free' or metallic gold, and the presence of gold can be determined only by assay or analysis. A few such discoveries have recently been made, accidentally, by inexperienced persons, who had rock assayed from curiosity. Similarly again, in the last few years gold has been found in most unpromising-looking porphyry dikes--the very rocks prospectors the world over have regarded as necessarily barren because they almost invariably fail to show any 'free' or metallic gold by the miner's quick 'horn' or 'pan' test. But mining engineers and prospectors are learning that in a mineralized region gold may occur in any rock, and hundreds of prospectors are assaying all sorts of most unpromising-looking rock, satisfied that by assay alone can they determine whether a certain rock is gold-bearing or not. This persistent and more or less systematic work now going on in every mining district must result in the discovery of many valuable deposits in unexpected localities, and ultimately promises to add largely to the annual output of gold." MINOR PARAGRAPHS.