Gill, John, active 1872-1903. The art of teaching young minds to observe and think. Fully illustrated by sketches and notes of lessons. By John Gill ... - 4th ed., greatly enl. - London, Longmans, Green, and co., 1878. - vii, 208 p. 17 cm. LCCN: e 10001066 Subjects--Topical Terms: Teaching.