No coin nor oath required. For personal study only.
These two small volumes are the fifth and sixth of the Oxford Visual Series, dealing with scientific subjects. The series is designed to stimulate interest in the subject among those who know little or nothing about it. Although essentially picture books, the text is well written and ties in with the illustrations.
How Time Is Measured relates the story of time-keeping from ancient to modern times and covers the calendar, sun-dials, all kinds of clocks and their works, the chronometer, radio time signals, watches and daylight saving time.
Life in Fresh Water is an account of the plants and animals living in fresh water ponds, streams and marshes. In addition to outlining the living habits of the various forms of life--including feeding, breathing, reproducing--the book classifies the plants and animals and suggests methods for collecting specimens and maintaining them in aquaria.
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