TRANSCRIBER'S NOTES

Obvious typographical and punctuation errors have been corrected after careful comparison with other occurrences within the text and consultation of external sources.

More detail can be found at the end of the book.

A PRIMITIVE USE OF THE ANIMAL MACHINE THAT IS STILL IN VOGUE IN MANY EUROPEAN COUNTRIES.

(From the painting by J. Didier, in the Musée du Luxembourg, Paris.)

[EVERY-DAY SCIENCE]