He was awarded UNESCO 's Kalinga Prize for the popularisation of science in 1953 , the Darwin Medal of the Royal Society in 1956 , and the Darwin-Wallace medal of the Linnaean Society in 1958 . He was awarded UNESCO 's Kalinga Prize for the popularisation of science in 1953 , the Darwin Medal of the Royal Society in 1956 , and the Darwinâ `` Wallace Medal of the Linnaean Society in 1958 .