PREPACE.
The following pages make no pretence to be anything more than a contribution to the clinical history of the diseases of which they treat. They are some of the fruits gathered in a wide and rich field, for the observation of diseases of the chest, in which it has been my privilege to labour, and comprise the substance of the Lumleian Lectures which I had the honour of delivering before the Royal College of Physicians. In the opinion of many who did me the favour of listening to the lectures, it was deemed desirable that the facts here recorded should be made available for the profession at large; and I, therefore, submit them in this form to my fellow labourers. Deeply conscious as I am that the lectures
