Pigs eat coal with relish, digest it with ease. As laboratory animals they are therefore incapable of shedding much light on human nutrition. Rats, on the other hand, have the same eating habits as man. They need the same minerals and vitamins, fall prey to many of the same diseases. On them new serums, drugs and poisons are tried out. More experimental work has been done with the white, pink-eyed rat (Mus Norvegicus albinus) than with the meek guinea pig more, in fact, than with all other mammals combined. If men are ever...
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