 He also examined the composition of gutta percha and conducted experiments on field rockets.Mouat also took an interest in photography working with the Frenchman Oscar Mallitte (1829–1905) in the Andamans and serving as the first president of the Photographic Society of Bengal (1856–57).In an article in the Lancet in 1892 in response to a debate on banning opium he opposed comparison of opium to alcohol, pointing out that opium use did not come with law and order problems.