1From Thomas Jefferson to Benjamin Waterhouse, 25 December 1800 (Jefferson Papers)
I recieved last night, and have read with great satisfaction your pamphlet on the subject of the kine-pox, and pray you to accept [my] thanks for the communication of it. I had before attended to your publications on the subject in the newspapers, and took much interest in the result of the experiments you were making. every friend of humanity must look with pleasure on this discovery, by...