' A Grist Mill Run bj- Gil. : Tht-y have great deposit- of gas un-'drr un-'drr the city of Erie which ire now i being utilized for waiiufacturirj3 pnr-I pnr-I posts. All that is ne-c-essary is to bore and sink a tube four or five hundred feet, at an expense of a thousand or fifteen hundred dollars, when the gas , rushes up and is used for ger.eraunc j steam. The Erie RtpnUican rives th , following account of the fi.juriD.s mills of Oliver - Baca. imw run fv this kind of fuel : It is perhaps a month -it j.e thev erec'.ed their derrick, and strjtcd to drill. They penetrated the r-k A'jZ lect. and the omLrs cot foots up, for drilling, casing, pipe, &c, about 51,500. Their mill contains ioar run of .-tones, with a canacity of teii barrels bar-rels per hour. To obtain power for 'his they have two boilers of forty horse power each, which are entirely heated by the gas from the we:l. anil they estimate thev have enouch in ad dition to produce power for two additional addi-tional run of stones. On Monday morning last, when the water and boilers were entirely cold, they turned on the gas by a stop cock, touched it with a match.,' and in forty minutes the mill was running. This is getting up steam with a celerity truly astonithing. As to the saving, the mere statement nf tlie cost of coal during dur-ing the month of June will exhibit in a more striking light than anv words of ours. Their bill for coal, "then, for fifteen hours per day running, for that month, was $400. Now they have a constaut juppiy of fuel the entire twenty twen-ty four hours capable of producing power to run six run of stones instead of four, at a permanent outlay of $1,500. A slight mathematical calcu-la'ion calcu-la'ion will show that if the proprietors of these mills only wish to keep them at the present capacity, and run th-m the same number of hours, they make a saving of about $5,000 per year, to say no hing of the wages a fireman and other labor which machinery run by coal entails. But if they should wish to add the other two run of stones, or add to the number of hours run with their present capacity, the amount will show still larger. But the enquiring reader will ask, will this supply of fuel last? We can only judge what will be by what has been. The Altoff well, in the southern part of the city, put down eight or ten years ago, is still producing produ-cing gas as strongly as when first sunk. Its volume is as large, if not larger, than this one immediate! under consideration. con-sideration. The wells put down on Ninth street, and also near the corner of Holland and Seventh streets, from which the i'uel is furnished to carry on the petroleum brass foundry of Jar-ecki Jar-ecki A: Co., and Brevillier's soap works, still hold on with no perceptible diminution. From these facts we can answer that experience and time, the only criterion, all show that this source of fuel is permanent and reliable. . So well convinced of all this are tho-e who have investigated the subject, that very many of our manufacturers are preparing to avail themselves of the advantages which this hitherto neglected neg-lected source of wealth furnishes in the production of f uel, for their mills and factories, and even for dwellings. Lycoming, l'u.t Gazette.