I HAD a favourite cat which was having fits and becoming dangerous, so, to destroy it as painlessly as possible, I inserted several grains of morphia in the centre of a piece of foie gras which was cut in two, great care being taken that no morphia was spilt on the outside. The cat on being shown the foie gras expressed in every way its eagerness for it, but when it got within three feet of the foie gras, turned round and looked at me with intense astonishment, and then after another sniff walked away, though previously it had always worried for a small piece. The special point is that the cat could detect something dangerous through the strong smell of the foie gras, though morphia, even in considerable quantities, has to most persons only a faint odour.
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EDRIDGE-GREEN, F. The Sense of Smell of Cats. Nature 130, 510 (1932). https://doi.org/10.1038/130510b0