Paper, 'On the differences in the structure of calculi, which arise from their being formed in different parts of the urinary passages, and on the effects that are produced upon them, by the internal use of solvent medicines' by Mr W [William Thomas] Brande in a letter to Everard Home Subject: Medicine/Physiology Published in Philosophical Transactions as 'A Letter on the Differences in the Structure of Calculi, which arise from their being formed in different Parts of the urinary Passages; and on the Effects that are produced upon them, by the internal Use of solvent Medicines, from Mr. William Brande to Everard Home, Esq. F. R. S'. Sent by Brande from Arlington Street. Communicated by Everard Home. Read 19 May 1808. 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. 23 April 1808