Mrs. Minnie D. Louis, widow of Adolph Louis and for more than a generation a leader in philanthropic educational activities on the lower side, founder, in 1880, of the Louis Down Town Sabbath School, died suddenly yesterday morning of heart disease at her residence, 9 Livingston Place, in her eighty-first year. The school that Mrs. Louis established developed into the larger instituion now known as the Hebrew Technical School for Girls, of which Adolph Lewisohn is President."