SCIENTIFIC

Burckhardt (1773-1825) was a German astronomer, who first computed the orbits of a number of comets. First and only edition. Quarto. Pages: viii + 88. A rare survival, but in very poor condition: grubby, creased, stained and frayed at edges. In remains of makeshift wraps. Text perfectly legible throughout. Some scholarly annotations in pencil and pen.

British engineer (1862-1932), President of the Institution of Mechanical Engineers, and for thirteen years 'Engineer-in-Chief, Charing Cross, West End, and City Electric Supply Corporation, Ltd'. One page, quarto. Very good. Thanks Menzies for a copy of the Society's journal, 'including Dr. Crowley's Paper with my contribution'. Signed 'W. H. Patchell'.

British Tory politician (1786-1855). The recipient was the wife of the noted surgeon Sir Benjamin Brodie the elder (1783-1862). He thanks her for 'the valuable present which you have conveyed to me through Lady Inglis. The subject is one of the deepest interest; and your honoured father ['Serjeant Sellon, a lawyer of repute', according to the DNB] will have treated it with corresponding devotion as well as learning'. He sends his regards to her husband, and signs 'Robert H. Inglis'.

8 leaves, 8vo, paginated [5-6] 7-19 [1]. Stitched: in contemporary brown plain wraps. In good condition, though folded in half lengthwise and with wraps rather grubby. Inscription reads 'Dr Tyndall FRS &c &c | from J P G'.

Entomologist (1924-), author of the monumental 'Generic names of moths of the world' (6 vols, 1975-91). The recipient is the author of several works on gardening. 1 page, 8vo. In good condition, but creased and with one closed tear and with sellotape stains at head and foot. He thanks his correspondent for the letter of 10 September enclosing a caterpillar, and compliments him on its preservation. '[I]t is in perfect condition for determination. It is very difficult to preserve the green coloration, as in life.' He identifies the specimen as a cabbage moth.