MSc Manch 1914, MB ChB 1916, MD 1934; MSc Camb 1936.
The brother of Charles Paget Lapage, Lapage studied zoology at the University of Manchester, graduating with first class honours in 1912. He received the M.sc. in 1914 and took his medical degree in 1916. In 1934, he received the MD from the University of Manchester.
He was an assistant lecturer and demonstrtor in zoology from 1912 to 1915 at the University lecturer in zoology at the University of Manchester when he also udertook work at the Lister Institute, London. During the First World War, he was as a captain the RAMC, serving in Mesopotamia as a protozoologist to the 32nd British General Hospital in Amara, specialising in diagnosis of protozoal diseases. Lapage returned to Manchester as a lecturer in zoology until 1928, when he moved to the University College of the South West, Exeter to set up a zoology department. In 1932, he moved to Cambridge where he worked as a parasitologist at the Institute of Animal Pathology. From 1952 to 1954 he was lecturer in animal pathology at the University of Cambridge.
lapage was best-known as a parasitologist, and he published a number of important studies in this subject including Parasitic Animals 1951, Veterinary Parasitology (1956) and Animals Parasitic in Man (1957, 1963). Lapage also wrote books for children, and some volumes of verse, as well as Art and the Scientist (1961), a study of drawings by scientific men.