The items in this collection comprise returns from local Thenientes to a survey launched by the Justicia mayor of Sonora province, Patricio Antonio Gómez de Cossio. The subject of the survey was the fruits, trees (economic and medicinal) and medicinal herbs of the province.

Papers of Arthur Francis George Kerr, 1906-c 1940, comprising 28 diaries, some relating to his daily life and others are expedition diaries retracing various itnieraries, including field diaries from Siam and the Siam-Burman border; photographs of landscapes, people, vegetation and other subjects, chiefly on trips within Siam; plant records including 158 plant tag books mentioning their numbers and the areas covered; typescript and manuscript lists recording plants collected by others on behalf of Kerr; 16 files and volumes relating to the flora of Siam, some are for specific regions such as Bangkok or Kaw Tao and some for specific plants such as orchids; volumes containing Siamese local plant names; twenty three notebooks of notes taken from various Herbaria, namely Geneva, Kew, Paris and the British Museum (Natural History Museum); records of other collectors including some commissioned by Kerr; records of plants from Siam for the publication of Flora Siamensis Enumeratio; notes and correspondence relating to Siamese drugs and medicinal plants; slips for various plant groups; 11 files of correspondence, mainly related to botanical matters including the publishing of Florae Siamensis Enumeratio, one with Royal Botanic Gardens, Kew and seven relating to ferns, including correspondence and fern lists from Eryl Smith; and publications including reprints from The Record and reports on Botanical Tours undertaken in Siam as well as crops such as cotton and various other plants, published by The Botanical Section, Ministry of Commerce, Bangkok and volume of sketches of Orchids from Chengmai.

Papers of Samuel Holland, 1740, comprising four volumes of manuscript notes from Charles Alston's lectures on 'Materia Medica'. The first volume is titled Dr Alston's Lectures, 1740. The other volumes are: Volume 1 containing notes on minerals, lead, silver, copper, iron, tin, alumen, borax and vitriolum, 1740; Volume 3 containing notes on vegetables, roots, bark, leaves and flowers, 1740; Volume 4 containing notes on fruits, seeds, juices, and animals, 1740.

Papers of Henry John Elwes, 1865-1920, comprising notes and notebooks; photographs of trees and furniture and assorted press cuttings and additional papers.