Paper, 'Upon the extent of the expansion and contraction of timber in different directions relative to the position of the medulla of the tree' by Thomas Andrew Knight in a letter to the Rt Hon Sir Joseph Banks Subject: Botany Published in Philosophical Transactions as 'Upon the extent of the expansion and contraction of timber in different directions relative to the position of the medulla of the tree. By Thomas Andrew Knight, Esq. F. R. S. In a letter addressed to the Right Hon. Sir Joseph Banks, Bart. G. C. B. P. R. S'. Read 8 May 1817. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 2, 1833. 26 April 1817