XVIII.

ON THE CRYSTALLIZATION OF CAST IRON.

Twenty-three years ago I sent you a paper on theCrystallization of Cast Iron ;* and at the same time I for-warded to my friend, Mr. Lowry, a complete set of spe-cimens, to be by him engraved, illustrative of what waspt that time considered a new and rather interesting sub-ject. Mr. Lowry’s more important engagements, how-ever, prevented him from completing the undertaking;a nd as the paper had a reference to the different varieties°f iron sent him, its insertion in the Magazine was atfirst postponed, waiting for the plates, and in time be-came overlooked and forgotten.

. ^fi e subject was brought to my recollection abouteighteen months ago, while reading a paper on metal-urgic crystallography in Dr. Brewster’s Journal, by Pro-essor Haussman, wherein the crystallization of iron isu y described; and more particularly within these feways, in consequence of being informed that Dr. Wollas-ton had discovered titanium in the copper coloured cu-ical ciystals, which are sometimes found in the old fur-nace hearths at smelting iron works.

I cannot help feeling it as a matter of considerable re-gret, that circumstances occurred to prevent the publi-cation of my paper on this subject at the time intended,as t e attention of Dr. Wollaston and other able men inthe scientific world might have been earlier attracted,

* Addressed to the Editor of the “Phil. Magazine,” Jan. 1823.