Of all the scientific institutions in Britain the Zoological Society had the largest funds. Charles Babbage remarked in his Reflections on the decline of science in England (1830) that the enormity of the society's income was ‘a frightful consideration’. The society's affluence placed it in a different category from other scientific institutions and also drew public attention to its spending patterns. Whereas most scientific institutions were funded by voluntary subscriptions, the Zoological Society had an additional source of income: receipts from admission to the London Zoo. The potential was clearly identified by William Swainson, naturalist and external critic of the society, who explained its two principal aims in his A preliminary discourse on the study of natural history (1834): promotion of ‘legitimate science’ and provision of ‘popular recreation’. He hoped that the society would unite these spheres:

His proposals questioned the public rationale of the Zoological Society, but their importance hardly registered at a time when the society had such confidence in the popularity of the zoo.