[(p. 71)]. Roman mills. A scholarly discussion of the subject of Roman mills, based on a comprehensive study of the references in classical literature, is given in Beckmann's History of Inventions, London, 1846.
[(p. 73)]. Recent advances in water wheels. As stated in the text, the quotation is from an article on Motive Power Appliances, by Mr. Edward H. Sanborn, in the Twelfth Census Report of the United States.
CHAPTER V
CAPTIVE MOLECULES; THE STORY OF THE STEAM-ENGINE
[(p. 82)]. The experiments of Hero of Alexandria. For a full account of the experiments see vol. I., pp. 249, 250.
[(p. 84)]. The Marquis of Worcester's steam engine. The original account appeared, as stated, in the Marquis of Worcester's Century of Inventions, published in 1663.
[(p. 92)]. Newcomen's engine. As stated in the text, the account of Newcomen's engine is quoted from the report of the Department of Science and Arts of the South Kensington Museum, now officially known as the Victoria and Albert Museum.
[(pp. 107-109)]. James Watt. The characterization of Watt here given is taken from an article in an early edition of the Edinburgh Encyclopædia published about the year 1815.
CHAPTER VI