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 292 a method of sharpening her claws; but a necessary process by which the muscles and tendons of her feet are stretched, so that they may work readily and strongly. "The retraction of the claws for lengthened periods," he says, "must tend to contract the tendons; therefore cats fix the points of their claws in something soft, and bear downwards with the whole weight of the body, simply to stretch, and, by use, to strengthen the ligatures that pull the claws forward."

So, too, the cruel playing with the injured mouse is not mere sportiveness on Pussy's part. She disables her victim, and then lets it run, that she may leap upon it again and again, thereby keeping herself in perfect practice. Stiffness of limb, slowness of action, would soon mean for her no mouse and no dinner. She dare not lose the supple spring which secures her prey; and the merciless game she plays is really a military manoeuvre, taught her by unpitying nature, and absolutely necessary — like other military manoeuvres—if the business of killing is to continue. Mrs. Wallace, in a pretty paper on some cats of Oxford, tells us of a gallant old Tom who did not believe in the arts of war, and whose method of attack upon the alert young robins was purely British in its ingenuousness. "Despising cover, he galloped slowly down the garden to the spot where the bird was feeding, and never