'The Danish Gas Company 1853-1953', illustrated centenary history in English and Danish (G.P.Bidder 1806-78 was a founder); folder of graphs on oscular current; unmarked envelope of miscellaneous notes and typescripts; notes on the dimensions and physics of the canal system and on the advantage of increase in bulk to an organism (file); The Ancient History of Sponges and Animals (drafts with many details), and The Status of Sponges (small packet); small packet of letters from scientists; press cuttings on GPB's address to the British Association 1927 (small envelope). Offprints of various papers by GPB (loose), and envelope with reprints, marked `a complete set?' by AMB; drawings of collar cells (small envelope); drawings of collar cells (small pocket file); drawings of flagellate chambers (file)