BRIEF [O.A.] Mereditt, R... E... Author: Mereditt, R... E... Recipient: Haeckel, Ernst Dating: 27.04.1905
BRIEF [O.A.] Grosart, A... B... Author: Grosart, A... B... Recipient: Haeckel, Ernst Dating: 29.09.1894
BRIEF [O.A.] Ball, V... Author: Ball, V... Recipient: Haeckel, Ernst Corporation: Science and Art Museum Dating: 27.02.1888
BRIEF [O.A.] Bedford, Henry Author: Bedford, Henry Recipient: Haeckel, Ernst Corporation: All Hallows College Dating: 05.12.1883
BRIEF [O.A.] Norwood, John Author: Norwood, John Recipient: Haeckel, Ernst Corporation: British Association for the Advancement of Science Dating: 05.04.1878