John Ramsay MAC CULLOCH (1789–1864), Scottish economist. L.A.S., London, May 29, 1826, to Mr. Kent, secretary of the London Institution; 1½ pages, in-4 format, addressed with a red wax seal bearing his monogram; in English. He would like to move his next lecture at the Institution to the morning of June 6, instead of the afternoon of Wednesday, June 7. He has spoken with several people who do him the honor of attending his lectures, and they have no objection; he will inform his audience on Monday: “so that the change will occasion no inconvenience to anyone connected with the Institution”…