Autograph Letters

3 pages, 8vo, lined paper, detailing the features of the thermometer he used for measuring soil temperature ('...the scale was made of box wood & had a hinge 2 or 3 inches above the bulb...'), with a sketch, explaining the basic requirements of a thermometer to take similar measurements ('...any thermometer which allows separation of the bulb from the case will do...') and suggesting manufacturers, ink slightly faded, remains of mount on final blank.

2 pages (30.6 x 21.5 cm) on a bifolium, Algiers, 1 June 1763, to an unknown recipient, docketed on verso of integral blank 'Algiers 1 June 1763 Consul Bruce'; a bit faded, some short fold separations.

8vo (165 x 250 mm); 3pp., on royal monogrammed paper, creased across centre resulting from previous fold, one spot to opening page, otherwise fine.