David William Mitchell was a zoologist and illustrator. He was responsible for the construction of the fish house - the first public aquarium - in 1853. He was ZSL Secretary from 1847-1859.
Philip Lutley Sclater was an English zoologist and lawyer. He is best known for his work on ornithology. He was the longest serving ZSL Secretary, for 42 years between 1859-1902. In this time he corresponded with countless people around the world, and these letters are the ones that are extant.
Peter Chalmers Mitchell was a Scottish zoologist, and ZSL Secretary from 1903-1935. He was responsible for founding Whipsnade Zoo.
Diaries kept by staff that record events, visitors, health of animals etc., in the Reptile House at London Zoo
Attendances of Zoological Society of London Council meetings
Records relating to war measures taken by the Zoological Society of London
Records relating to damages caused by bomb damage and enemy action
Reports to the Zoological Society of London War Emergency Committee