Walrus, feet of, [157]

Water, crystallization of, [63]

Water man's first mirror, [112]

Waves, how formed, [199]

Waves, height of, [200]

Wedge, [242]

Weight, [52], [82-85]

Wheel and Axle, [235]

Wheel-barrow a lever, [231]

Whispering galleries, [261]