The discovery of Titanium by Mr. Mushet in the hearth of a blast-furnace in 1794 would now be regarded as a mere isolated fact, inasmuch as Titanium was not placed in the list of recognised metals until Dr. Wollaston, many years later, ascertained its qualities. But in connection with the fact, it may be mentioned that Mr. Mushet's youngest son, Robert, reasoning on the peculiar circumstances of the discovery in question, of which ample record is left, has founded upon it his Titanium process, which is expected by him eventually to supersede all other methods of manufacturing steel, and to reduce very materially the cost of its production. While he lived, Mr. Mushet was a leading authority on all matters connected with Iron and Steel, and he contributed largely to the scientific works of his time. Besides his papers in the Philosophical Journal, he wrote the article "Iron" for Napiers Supplement to the Encyclopaedia Britannica; and the articles "Blast Furnace" and "Blowing Machine" for Rees's Cyclopaedia. The two latter articles had a considerable influence on the opposition to the intended tax upon iron in 1807, and were frequently referred to in the discussions on the subject in Parliament. Mr. Mushet died in 1847. [1] Dr. Roebuck's grandson, John Arthur Roebuck, by a singular coincidence, at present represents Sheffield in the British Parliament. [2] The carronade was invented by General Robert Melville [Mr. Nasmyth says it was by Miller of Dalswinton], who proposed it for discharging 68 lb, shot with low charges of powder, in order to produce the increased splintering or SMASHING effects which were known to result from such practice. The first piece of the kind was cast at the Carron Foundry, in 1779, and General Melville's family have now in their possession a small model of this gun, with the inscription:--"Gift of the Carron Company to Lieutenant-general Melville, inventor of the smashers and lesser carronades, for solid, ship, shell, and carcass shot, &c. First used against French ships in 1779."