The crossword solutions for the term 'Herr in Madras' are SRI, which stands for Sri Ramanujam Iyengar. He was an Indian mathematician and philosopher who lived in the city of Madras (now Chennai) during the early 20th century. He is best known for his contributions to number theory, infinite series, and continued fractions. He was also a devout Hindu and wrote extensively on the philosophy of Vedanta.