“He refused a long time, but at last, upon seeing me uneasy, consented. I sent for Quenay, first ordinary physician to the King. He sent me word he was ill. I then sent for Senac; he was ill likewise. I went to Quenay myself to beg that, notwithstanding his illness, which was not dangerous, he would come to see the Duke. He told me he was an old infirm man, whose attendance could not be depended on, and advised me as his friend to depend upon De la Saone, first physician to the Queen. I went to De la Saone. He was gone out, and was not expected home that night. I returned to Quenay, who followed me immediately to the Duke. It was by this time seven at night. The Duke was in the same profuse sweat which he had been in all day and all the preceding night. In this situation Quenay declared that it was improper to do anything till the sweat should be over. He only ordered him some cooling ptisane drink. Quenay’s illness made it impossible for him to return next day (Monday), and De la Saone has waited on the Duke ever since, to my entire satisfaction.” In reading this we are reminded of a passage in the _Wealth of Nations_ where Quesnai is described as “a physician, and a very speculative physician,” who thought the health of the human body could be preserved only by a certain precise regimen of diet and exercise, the slightest violation of which necessarily occasioned some degree of disease or disorder. The letter to Townshend continues:— “Depend upon hearing from me by every post till his perfect recovery; if any threatening symptom should appear I shall immediately despatch an express to you; so keep your mind as easy as possible. There is not the least probability that any such symptom ever will appear. I never stir from his room from eight in the morning till ten at night, and watch for the smallest change that happens to him. I should sit by him all night too if the ridiculous, impertinent jealousy of Cook, who thinks my assiduity an encroachment upon his duty, would not be so much alarmed, as it gave some disturbance even to his master in his present illness.”