Letter from ---? to Houghton Mifflin Co., 1916 December 28

Letter is on yellow paper accompanied by 2nd page (white) containing information referred to in letter re: Berliner's contribution to invention of telephone.
Letter concerns the lack of mention of Emile Berliner's contribution to the development of the telephone in the article "Birth and Babyhood of the Telephone" by T. A. Watson, published in volume 14 of "Children's Hour."