Paper, 'On the laws of polarisation and double refraction in regularly crystallised bodies' by David Brewster in a letter to the Rt Hon Sir Joseph Banks 104 manuscript pages and two plates showing concentric rings of polarised light and refraction of light on various crystal samples. Subject: Physics Published in Philosophical Transactions as 'On the laws of polarisation and double refraction in regularly crystallized bodies. By David Brewster, LL. D. F. R. S. Lond. and Edin. In a letter to the Right Hon. Sir Joseph Banks, Bart. G. C. B. P. R. S'. Written by Brewster in Denlaw. Read 15 January 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. 1 June 1817