Paper, 'On the laws which regulate the absorption of polarised light by doubly refracting crystals' by David Brewster in a letter to the Rt Hon Sir Joseph Banks Subject: Physics Published in Philosophical Transactions as 'On the laws which regulate the absorption of polarised light by doubly refracting crystals. By David Brewster, LL. D. F. R. S. Lond. and Edin. In a letter addressed to the Right Hon. Sir Joseph Banks, Bart. G. C. B'. Written by Brewster in Edinburgh. Read 12 November 1818. 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. 17 October 1818