In the seventieth and seventy-first volumes of the London Philosophical Transactions, the reader will find an account of some Experiments and Observations made here upon cold in the years 1780 and 1781.

Though, at first, I had no other view but that of keeping a register of the very cold weather which set in on the 13th January 1780, yet I was soon led to extend the plan of my observations, upon meeting with a new phænomenon, which appeared to me to deserve some attention. This phænomenon consisted in a constant difference of temperature of the snow which, at that time, covered the fields, and that of the air at a few feet above: the snow being the coldest.