No fresh occurrence thenceforward arrested the progress of the operation; and on the 10th of June, twenty days before the expiration of the period fixed by Barbicane, the well, lined throughout with its facing of stone, had attained the depth of 900 feet. At the bottom the masonry rested upon a massive block measuring thirty feet in thickness, whilst on the upper portion it was level with the surrounding soil. President Barbicane and the members of the Gun Club warmly congratulated their engineer Murchison: the cyclopean work had been accomplished with extraordinary rapidity. During these eight months Barbicane never quitted Stones Hill for a single instant. Keeping ever close by the work of excavation, he busied himself incessantly with the welfare and health of his workpeople, and was singularly fortunate in warding off the epidemics common to large communities of men, and so disastrous in those regions of the globe which are exposed to the influences of tropical climates. Many workmen, it is true, paid with their lives for the rashness inherent in these dangerous labours; but these mishaps are impossible to be avoided, and they are classed amongst details with which the Americans trouble themselves but little. They have in fact more regard for human nature in general than for the individual in particular. Nevertheless, Barbicane professed opposite principles to these, and put them in force at every opportunity. So, thanks to his care, his intelligence, his useful intervention in all difficulties, his prodigious and humane sagacity, the average of accidents did not exceed that of transatlantic countries, noted for their excessive precautions, France, for instance, among others, where they reckon about one accident for every two hundred thousand francs of work. CHAPTER XV. THE FÊTE OF THE CASTING. During the eight months which were employed in the work of excavation the preparatory works of the casting had been carried on simultaneously with extreme rapidity. A stranger arriving at Stones Hill would have been surprised at the spectacle offered to his view. At 600 yards from the well, and circularly arranged around it as a central point, rose 1200 reverberating ovens, each six feet in diameter, and separated from each other by an interval of three feet. The circumference occupied by these 1200 ovens presented a length of two miles. Being all constructed on the same plan, each with its high quadrangular chimney, they produced a most singular effect. It will be remembered that on their third meeting the Committee had decided to use cast-iron for the Columbiad, and in particular the _white_ description. This metal in fact is the most tenacious, the most ductile, and the most malleable, and consequently suitable for all moulding operations; and when smelted with pit coal, is of superior quality for all engineering works requiring great resisting power, such as cannon, steam-boilers, hydraulic presses, and the like.