Scientific notebooks, mostly on sponges, some dated and indexed by GPB, and labelled by Anna Bidder as follows: 1886-7, 1890-92, Register of sponges, notes on chemical/histological procedures, diagrams of scythomedusae, hydromedusae 1888, (2 notebooks) 1920-22, physics of sponges (jet, osculum, chambers) 1921-22, spicule measurements and optical analyses 1922(B), flow, and notes dated 1930 1924(A), (Plymouth) 1924(B), flagella, including a page dated 15 April 1924, and some translations from Greek history 1923, 1924(D), calculations of flow 1931-1937, spicules, oscula 1932, jet, size of collared cells, rapidity of flagella 1932, collar cells, oscula, spicules 1933, velocity of jet, work done by collar cells 1934, 1935, 1938, physics of the jet n.d., experiments with artificial jet, theory of jet n.d., not marked, apparently extracts from published works