“ Jackson's own and that it was carried out by him "doubtless with the aid of the staff of the Kew Herbarium," but chiefly by assistants employed for this special purpose. (Journal of Botany, Vol. XXII., 1893.)
Dr. Jackson's outstanding characteristic was his extreme helpfulness. He was always ready to take infinite pains to assist anyone in need of information in those departments of knowledge to which he had specially devoted himself, and the claims on his time were innumerable. For instance, he was secretary to the Treasury Departmental Committee on botanical work in 1900-01. ”

“ Jackson was a Londoner, born on April 3, 1846. He was educated at private schools, and he seems early to have developed his interest in botany, for he became a Fellow of the Linnean Society before he was 22, and when he was 34 was appointed its secretary, an office which he filled with distinction from 1880 till 1902, when he became general secretary. He was also a member of the council from 1880. A man of great erudition and industry, he had few equals in his knowledge of botanical literature. ”