Paper, 'On the causes which influence the direction of the growth of roots' in a letter from T A [Thomas Andrew] Knight to the Right Hon Sir Jos [Joseph] Banks Subject: Botany Published in Philosophical Transactions as 'On the causes which influence the direction of the growth of roots. By T. A. Knight, Esq. F. R. S. In a letter to the Right Hon. Sir Joseph Banks, Bart. K. B. P. R. S'. Written by Knight at Downton. Read 7 March 1811. 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 1, 1832. 15 January 1811