[Footnote B: The morning of my first interview with Earl St. Vincent he was very communicative. I explained to him a Torpedo and the _Dorothea_ experiment. He reflected for some time, and then said, Pitt was the greatest fool that ever existed, to encourage a mode of war which they who commanded the seas did not want, and which, if successful, would deprive them of it.] This fortunate experiment left not the least doubt on my mind that the one which I made in the harbour of New-York in August 1807, would be equally successful. The brig was anchored, the Torpedoes prepared and put into the water in the manner before described; the tide drove them under the brig near her keel, but in consequence of the locks turning downwards, the powder fell out of the pans and they both missed fire. This discovery of an error in the manner of fixing the locks to a Torpedo, has been corrected. On the second attempt, the Torpedo missed the brig; the explosion took place about one hundred yards from her, and threw up a column of water ten feet diameter sixty or seventy feet high. On the third attempt she was blown up: the effect and result much the same as that of the _Dorothea_ before described. About two thousand persons were witnesses to this experiment. Thus, in the course of my essays, two brigs, each of two hundred tons, have been blown up. The practicability of destroying vessels by this means, has been fully proved. It is also proved, that the mechanism will ignite powder at any required depth under water within a given time. It now remains to point out means by which Torpedoes may be used to advantage with the least possible risque to the assailants. PLATE II