1To Thomas Jefferson from the Rev. James Madison, 22 January 1784 (Jefferson Papers)
I did not receive your Favour of the 24h Decr. untill last post. I immediately looked out for a Thermometer and obtained one which appears very sensible as to Heat or Cold, tho’ it is so constructed that I cannot ascertain the Accuracy of the Division by plunging it in boiling water; This appears of Consequence especially when we keep correspondent Observations. I shall observe the Time you...