Note 28 — The Correlation of Vital and Physical Forces.
Reading edition
Heidenhain, Mechanische Leistung Wärmeentwickelung und Stoffumsatz bei der Muskelthätigkeit, Breslau, 1864.
See also Haughton, Samuel, On the Relation of Food to work, published in “Medicine in Modern Times,” London, 1869, Macmillan & Co.