On one occasion, having been brought into a somewhat febrile condition by fatigue in a botanical excursion in hot weather, and having full faith in the statements of Doctor Cooke to the effect that calomel was of all antifebrile remedies the best, and that while a small dose of calomel might prove irritating _a good large dose_ "would sometimes act like an opiate," he took a one drachm dose in full confidence. But instead of the soothing, curative effect he had been led to expect, vomiting and severe irritation of the stomach resulted, so much so that no food but boiled milk could be tolerated for a week or so afterward. Shaken in his faith by his first experience, but not yet convinced of the error of the doctrine of his respected preceptor, the second trial of a drachm dose on a similar occasion completely satisfied him that something wrong had crept into the theory and practice of the honored professor. Doctor Cooke's only fear in his heroic use of calomel was that it would salivate. But for this untoward influence, he said, one might do almost anything with it. That this substance which, in cases of cholera, he administered so largely with no signs of irritation or salivation, until the patient was in a convalescent state, should sometimes in much smaller doses prove an irritant poison, he did not understand. A quotation from Doctor Yandell's _Memoir_, Page 7, illustrates this: "In some cases of fever Doctor Cooke administered a drachm of calomel at a dose, and repeated it until the patient had taken in twenty-four hours as much as two hundred and forty grains. A young lady was thus treated in 1826. After this quantity had been given she seemed much relieved, but to avert the danger of salivation he thought it prudent to administer jalap and cream of tartar. At night they were thrown up, without producing any purgative effect. She then took a drachm of calomel, and repeated it until she had taken five doses in the course of the night and morning, with the same fine effect in producing abundant bilious discharges, and a remarkably good effect on the symptoms generally." Still uneasy about ptyalism, he gave her cream of tartar all day, but at night it was thrown up as before, without moving the bowels. "My fears of the consequence of giving the only medicine which offered any prospect of saving her," he adds, "held my hand, and she continued to vomit till death relieved her. I reproached myself on her account afterward, and felt conscious that fear of a remote and uncertain evil had induced me to stand and see her die without doing all I might have done. I was convinced she would not have died had the calomel been continued." After she had thus taken more than an ounce of calomel he honestly believed that he had not given her enough of this medicine! Entirely ignoring the action of the cream of tartar in bringing this substance partly into the condition of a soluble irritant poison!