Miscellaneous notes on quantum field theory. Includes biography of Homi J. Bhaba; drafts of letters to Michael Martin Nieto, Samarendra Nath Biswas, draft text of talk on textbook about the role of mathematics in science dated 1975, UGC lectures on number curiosities, draft letter to Suraj N. Gupta, bibliographic notes on: PLN Rao's problem, spaceflight, mathematical games, martin gardner, number theory, linear indeterminate equations, nuclear fusion, group theory in solid state physics, magic squares, exactly solvable models, statistical mechanics.