Note on Page 77 * An error in the paper of Mr. Evans was corrected in our number for December, making the velocity 10½ miles per hour.

Note on Page 78 * This calculation is grounded upon the following data:—That in Montgolfier balloons one cubic yard of space has been found to give 11 ounces of power—that the form of the vessel will prevent it from receiving more than a third part of the resistance that its greatest cross-section would receive at the same velocity; and that a velocity of twenty-three feet per second in air, creates a resistance of one pound per square foot, according to some careful experiments of my own upon a very large scale.

Note on Page 81 * I can have no objection to keep a list of the names of such gentlemen as may wish to contribute to an experiment of the kind recommended.—A. T.

Note on Page 81 †

Note on Page 83 * [Cayley invariably uses “ condensation ” for “ pressure.”—W. L. M.]

Note on Page 84 *

Note on Page 86 * Sir George will have learnt by this time that the gentleman whom he here names is now no more. He was the gentleman who had agreed to subscribe fifty pounds.—Edit.

Note on Page 86 † I stated last year to Mr. Tilloch the amount of my subscription, as the original promoter, under certain conditions; for the present I shall say 50 pounds; but I by no means wish gentlemen disposed to forward experiments on this subject to subscribe upon a high scale, as a greater amount may probably be obtained in subscriptions of from one to ten pounds.

Note on Page 87 * [i.e., an airscrew.—W. L. M.]

Note on Page 87 † Nicholson's Journal for November 1809, p. 172.