Thomas was educated at Whitgift Grammar School and Queen's College, Oxford. He took the diplomas B.Sc. [Oxford] and M.Sc. [Durham] and wrote various papers on scientific research. He acted as Deputy-Superintendent at the Natural History Museum in Calcutta, Demonstrator in Zoology at Armstrong College, Newcastle, and Exhibitioner at Queens' College, Oxford. Thomas enlisted into the R.A.M.C. in January 1917, and entered the war in Malta on the 5th January 1917. He obtained a commission in April 1918. Thomas served as a Protozoologist and Bacteriologist at Malta in various hospitals. He was mentioned in despatches for his valuable service in diagnosis of dysentery. He died of pneumonia, following influenza, at "St Mildred's" Croydon. He was the son of the Rev. Thomas Bentham and Maud Bentham of 'St. Mildred's' Vicarage, Addiscombe, Croydon. The Director of Medical Services in Malta wrote "Your boy made himself a unique position here as a skilled scientist and a most lovable personality. His zeal, devotion to work and original bent of mind would have led him to great distinction in research work."