Hop-scotch to hare-and-hounds, conjuring to chemistry, rabbits to rowing — the complete Victorian repertoire of things for a boy to do, set down with rules and diagrams.
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Balancing (Centre of gravity in a body)
The centre of gravity in a body is that part about which all the other parts equally balance each other. In balancing a stick upon the finger, or upon the chin, it is necessary only to keep the chin or finger exactly under the point which is called the centre of gravity.