(33) 6 9 



PLAYFAIR, LYON, On the Food of Man in relation to his useful 

 ttv,,-*, Edinburgh, 1865. Proc. Roy. Inst., Apr. 28, 1865. 

 RANKE, Tetanus eine Physiologische Studie, Leipzig, 1865. 

 ODLING, op. tit. 



2$ VOIT, E., Untersuchungen iiber den Einfluss des Kochsalzes, 

 des Kaffees, und der Muskelbewegungen auf den Stoffwechsel, 

 Munich, 1860. 



SMITH, E., Philosophical Transactions, 1861, 747. 



FICK, A., and WISLICENUS, J., Phil. Mag., IV, xxxi, 485. 



FRANKLAND, E., loc. tit. 



NOYES, T. R., American Journal Medical Sciences, Oct. 1867. 



PARKES, E. A., Proceedings Royal Society, xv, 339 ; xvi, 44. 



26 SMITH, EDWARD, Philosophical Transactions, 1859, 709. 



27 Authorities differ as to the amount of energy converted 

 by the steam-engine. (See Note 16.) Compare MARSHALL, 

 op. tit., p. 918. "Whilst, therefore, in an engine one-twentieth 

 part only of the fuel consumed is utilized as mechanical power, one- 

 fifth of the food absorbed by man is so appropriated." 



28 HEIDENHAIN, Mechanische Leistung Warmeentwickelung 

 und Stoffumsatz bei der Muskelthatigkeit, Breslau, 1864. 



See also HAUGHTON, SAMUEL, On the Relation of Food to 

 work, published in "Medicine in Modern Times," London, 1869, 

 Masmillan & Co. 



29 HEIDENHAIN, op. tit. Also by FICK, Untersuchungen fiber 

 Muskel-arbeit, Basel, 1867. Compare also "Nature," i, 159, Dec. 

 9, 1869. 



30 Du BOIS-REYMOND, EMIL, On the time required for the trans- 

 mission of volition and sensation through the nerves, Proc. Roy. 

 Inst. Also in Appendix to Bence Jones's Croonian lectures. 



31 MARSHALL, op. tit., p. 227. 



32 MELLONI, Ann. Ch. Phys., xlviii, 198. 



See also NOBILI, Bibl. Univ., xliv, 225, 1830; Ivii, I, 1834. 



33 The apparatus employed is illustrated and fully described in 

 Brown-Sequard's Archives de Physiologic, i, 498, June, 1868. By 

 it the i-4ocoth of a degree Centigrade may be indicated. 



