Sebastian's observations on the new agent occupied several months. He had begun with the raccoon; he went on, of course, with those poor scapegoats of physiology, domestic rabbits. Not that in this particular case any painful experiments were in contemplation. The Professor tried the drug on a dozen or more quite healthy young animals--with the strange result that they dozed off quietly, and never woke up again. This nonplussed Sebastian. He experimented once more on another raccoon, with a smaller dose; the raccoon fell asleep, and slept like a top for fifteen hours, at the end of which time he woke up as if nothing out of the common had happened. Sebastian fell back upon rabbits again, with smaller and smaller doses. It was no good; the rabbits all died with great unanimity, until the dose was so diminished that it did not send them off to sleep at all. There was no middle course, apparently, to the rabbit kind, lethodyne was either fatal or else inoperative. So it proved to sheep. The new drug killed, or did nothing. I will not trouble you with all the details of Sebastian's further researches; the curious will find them discussed at length in Volume 237 of the Philosophical Transactions. (See also Comptes Rendus de l'Academie de Medecine: tome 49, pp. 72 and sequel.) I will restrict myself here to that part of the inquiry which immediately refers to Hilda Wade's history. "If I were you," she said to the Professor one morning, when he was most astonished at his contradictory results, "I would test it on a hawk. If I dare venture on a suggestion, I believe you will find that hawks recover." "The deuce they do!" Sebastian cried. However, he had such confidence in Nurse Wade's judgment that he bought a couple of hawks and tried the treatment on them. Both birds took considerable doses, and, after a period of insensibility extending to several hours, woke up in the end quite bright and lively. "I see your principle," the Professor broke out. "It depends upon diet. Carnivores and birds of prey can take lethodyne with impunity; herbivores and fruit-eaters cannot recover, and die of it. Man, therefore, being partly carnivorous, will doubtless be able more or less to stand it." Hilda Wade smiled her sphinx-like smile. "Not quite that, I fancy," she answered. "It will kill cats, I feel sure; at least, most domesticated ones. But it will NOT kill weasels. Yet both are carnivores." "That young woman knows too much!" Sebastian muttered to me, looking after her as she glided noiselessly with her gentle tread down the long white corridor. "We shall have to suppress her, Cumberledge.... But I'll wager my life she's right, for all that. I wonder, now, how the dickens she guessed it!" "Intuition," I answered.