Each replenishment could be conveyed in five colliers with 2300 tons apiece.

; it was called the 'Henri Grace à Dieu,' and was of 1000 tons burthen; it required 349 soldiers, 301 sailors, and 50 gunners to man her.

These mines, after having been closed for many years, were reopened at the beginning of the century, and now turn out upwards of one thousand tons of coal per day.

About 6,000,000 tons of pulpwood annually are now required to keep us supplied with enough paper.

It is found, experimentally, that in malleable iron tubes of the respective thicknesses of .525, .272, and .124 inches, the resistances per square inch of section are 19.17, 14.47, and 7.47 tons respectively.