Historically important Autographed Letter Signed

1812. unbound. 1 page, 10 x 8 inches, no place, August 9, 1812. In this letter, written to Allsops Bindings, Bancroft accepts the terms from his publisher in releasing an updated edition of the "...Philosophy of Colours," in full: "I am willing to accept the terms on which you propose to publish my work on the Philosophy of Permanent Colours, requesting only that you will allow me to take such copies not exceeding thirty or forty, as I may wish to give them to persons not likely to become purchasers...charging me for them the average cost of paper, printing, etc. In regard to the copies which it may be advisable to print, I think they should not be fewer than those of the former edition viz one thousand. Whether it may be prudent to increase the number to fifteen hundred is a question which I submit entirely to your consideration & decision. Should it suit Mr. Sidney to begin printing on Monday next and to call or send for a part of the work on Saturday or Sunday, if more convenient to himself, I shall be ready to deliver." Small chip at the top left corner; fraying at the bottom left corner; one-inch closed tear in the top margin. Very good(-) condition.<br/><br/> Scientist, physician, and British "double agent" during the American Revolutionary War. As a scientist he published the scholarly book "Experimental Researches Concerning The Philosophy Of Permanent Colours," released in 1794 and updated in 1813. As a spy he was recruited by his close friend Benjamin Franklin, who never revealed whether or not he suspected Bancroft of treason.<br/><br/>