MS.Add.4190: Entomological notebook, 1792-1794, 70 folios. The volume also includes rough accounts (pp. ii and iii); additional notes headed 'Insects copied J. W. C. 1806' (pp. 126-128); and a Latin couplet, with an English translation, and further later accounts (p. 135). Inside the front cover are four lines of verse. Pp. 42 and 129-133 are blank.
MS.Add.4191: Botanical notebook, c. 1795, 70 folios. Botanical classifications headed and labelled 'Flora anglica'.
MS.Add.4192: Chemical notebook, 1788-1817, 115 folios. A rough notebook containing a treatise on chemistry in eighteen chapters, and many miscellaneous chemical notes and recipes. Crabbe's autograph appears on fo. 3. On the binding outside the front cover is 'Dodgson'. Fos 75-113r are blank.
MS.Add.4194: Botanical notebook, c. 1800, 57 folios. Botanical classifications, with an index on p. 2.