Heliotype Company Limited
Company with premises at 22 Henrietta Street, Covent Garden, London. They supplied the photographs for Expression.
Sources
Correspondence vol. 19, letter from R. F. Cooke to G. H. Darwin, 13 August 1871
Post Office London directory 1872, p. 946.
Bibliography
Correspondence: The correspondence of Charles Darwin. Edited by Frederick Burkhardt et al. 29 vols to date. Cambridge: Cambridge University Press. 1985–.
Post Office London directory: Post-Office annual directory. … A list of the principal merchants, traders of eminence, &c. in the cities of London and Westminster, the borough of Southwark, and parts adjacent … general and special information relating to the Post Office. Post Office London directory. London: His Majesty’s Postmaster-General [and others]. 1802–1967.
