Page:Thoreau - As remembered by a young friend.djvu/161

 instead of iron balls, for grinding. Presumably this was after the Thoreaus' invention of the air-blast which gave the wonderfully fine powder to which they owed their success, for, before that, the grit of the stones would have spoiled the product. Mr. Miles thinks that John Thoreau, Sr., may have thought of the air-blast plan, but that Henry at any rate worked out the details. Mr. Miles took me to his mill to see the perfection and simplicity of the operation.

Mr. Horace Hosmer, who, for a time, was the travelling selling agent of the pencils, stated that the Bavarian clay was used here at that time by the New England Glass Company, and by the Phoenix Crucible Company of Taunton. Perhaps the Thoreaus bought it through these companies. The old pencils were filled by applying the warm mixture of graphite, glue and spermaceti or bayberry wax with a brush to the grooved half of the pencil. The Thoreaus' clay and graphite mixture, after casting into “leads,” hardened like stone and could stand intense heat.

Page 45, note 1. Thoreau writes: “Explore your own higher latitudes; nay, be a Columbus to whole new continents and worlds within you, opening new channels, not of trade, but of thought. Every man is lord of a realm beside which the earthly empire of the Czar is but a petty state. I do not wish to be any more busy