One of the foremost solar spectroscopist astronomers in the United States (1834-1908) who authored a widely used series of astronomy textbooks. ALS signed “C. A. Young,” one page, 5.75 x 9, The Observatory letterhead, October 8, 1903. Letter to Knickerbocker Publishing Co., in full: "I have carefully read over and corrected the Ms. sent me, and think no errors remain. I should be very glad to arrange for an illustration as proposed, but circumstances put it quite out of the question in any case." In fine condition.
