November 8, 1833 DELAWARE COUNTY REPUBLICAN FOR THE REPUBLICAN. MR. EDITOR. - In your last you have republished part of a document purporting to give a statistical account of the Mills, unimproved Mill seats, &c. in Delaware County. When that account was first made out in 1826, about eight years ago, it was in the main correct, but since that time the spirit of improvement has been so much abroad in our county as to render several alterations necessary. I will make a statement of some of the most important changes which have taken place on Darby and Cobb creeks, and their tributary streams. At No. 2, on Cobb creek, which is noticed as a mill seat, an extensive tilt mill has been erected by David SNYDER, at which all the spades and shovels stamped with his name are manufactured. At No. 2, on a branch of Cobbcreek, a large new grist mill has been erected this summer on the site of the old one mentioned in the document. At mill seat No. 4, on the same branch, a new saw mill has been erected by Abraham POWELL, calculated to do an extensive business. At No. 5, on Cobbcreek an extensive machine factory, and also a large machine card manufactory have since been erected by Coleman SELLERS. On the site of the grist mill, No. 13, on Cobbcreek, Mr. Dennis KELLY, who is now the proprietor, has erected a very extensive cotton factory. At No. 9. on Darby creek, a new paper mill has been erected on the site of the old one. At No. 13, on Darby creek, a large new grist and merchant mill has been erected in place of the old mill by Joseph B. LEEDOM. Also, at No. 15, an extensive new grist and merchant mill has been erected. At No. 18, on Darby creek, which is noticed as a mill seat, an extensive cotton manufactory has been erected. Any person acquainted with the improvements which have taken place on the other streams since the first publication of the document, would do well to furnish you with a notice of them.