""A Letter to the Secretary at War, on Sickness and Mortality in the West Indies"" is a book written by Andrew Halliday in 1839. The book is a review of Captain Tulloch's Statistical Report, which provides statistical data on the health and mortality rates of British soldiers stationed in the West Indies during the 1830s. Halliday's letter addresses the high mortality rates and poor health conditions of soldiers in the West Indies, and argues that...