The hot weather last summer affected even the herring fishery. The fishermen off the Scotch coast had been supplied with sea thermometers by the Scottish Meteorological Society, and they found that during one week, when the sea water showed a temperature of 58 deg. to 59 deg., no fish were caught. But when the temperature fell to 55 deg. the herring were caught in great abundance. Indeed, they flocked to the land in such numbers that many nets were taken to the bottom with their weight, and the fishermen lost considerable sums from this odd mishap. The action of the Meteorological has produced important results. The entirely new discovery has been made that the herring love cold water, and in seasons when the temperature of the sea water rises, they keep away from the land, in deeper water, between the fifteen to eighteen fathoms for which the nets are calculated. The colder the weather the greater is the take of fish; 1875, a year when the water was considerably and continuously warmer than 1874, having been a poor year, while the latter was a better one. This action of the fish makes it probable that it likes a given range of temperature, neither too high nor too low. In cold water this belt of agreeable temperature is found nearer the sun-warmed surface, and the fish creep inshore. Many singular facts relating to this fishery are known. If a thunderstorm occurs, the fishermen expect a good catch on that day, but the next day they will get none except in deep water, and the supposition is that the fish are leaving the land. The herring has a strong sense of locality, always returning to the same ground. Experienced dealers can tell by inspection in just what sea or loch a given lot of fish were caught. NATURAL GAS IN FURNACES. A paper describing the use of natural gas in the puddling furnaces at Leechburg, Pa., was presented by Mr. A. L. Holley to the American Institute of Mining Engineers. This well is about twenty miles northeast of Pittsburg, on one of the side tributaries of the Alleghany river. It had been drilled in search of oil to a depth of 1,250 feet in 1871, but none was found. A great flow of gas was developed, however, accompanied by a slight spray of salt water, and this has continued with little or no diminution to the present time. The gas in its escape has been discharged through a five-inch pipe, and at a pressure of from sixty to eighty pounds per square inch. The rolling mill of Messrs. Roger & Burchfield is on the opposite side of the river, and it has been for some years devoted to the production of fine grades of sheet iron from charcoal pig metal, by puddling and in knobbling fires. The usual weekly product of the mill has been thirty tons of No. 3 tin plates and fifty tons of No. 24 to twenty-eight sheets.