[1][2] He joined the British Medical Association in 1897 and was secretary of the Section of Pharmacology and Therapeutics at the London Annual Meeting in 1916.

[1] Watson authored the treatise "The Influence of Variations of Diet on the Tissues and Organs of the Body".

Watson conducted clinical research and contributed papers on autointoxication and treating gout, rickets, rheumatism and tuberculosis.

[1] His main work Food and Feeding in Health and Disease was positively reviewed by the medical community.

[7] It contains an appendix with a series of 22 papers by Watson and collaborators, "a record of experimental observations on the influence of diet on the structure of tissues.