In 1823 the Royal Society established a register of hourly observations of the thermometer at Leith Fort. They were made by the non-commissioned officers of artillery, and were continued for four years, from 1824 to 1827 inclusive. A report on these observations for the years 1824 and 1825 was published in the tenth volume of the Society's Transactions; but from causes to which it is unnecessary to refer, the report on the observations of 1826 and 1827 were not then published.