GREELEY, COLORADO, 11 



29. Conductivity of Nervous System: Y. Motora, Am. Jr. 

 of Psychol., vol. XIV, Nos. 3 and 4, July-Oct., 1903, pp. 

 329-350. 



30. Tiie Story of the Living iVlaciiine: H. W. Conn, Dynam- 

 ics of Life, Forces Operating in the Organism, etc. 



31. IVlind as a Machine: Oppenheim, Mental Growth and 

 Control, pp. 19-41, chap. 2. 



32. Studies in the Psychology of Alcohol: G. E. Partridge, 

 Am. Jr. of Psych., 1900, vol. XI, p. 318. 



II. ECONOMY IN THE EXPENDITURE OF ENERGY. 



1. The Conservation of Energy: O'Shea, Aspects of Men- 

 tal Economy, chap. 9, pp. 170-198. 



2. Mental Energy: Edw. Atkinson, Pop. Sci. Mon., vol. 

 LVII, pp. 632-637. 



3. Energy of Voluntary Action: Scripture, The New Psy- 

 chology, chap. 15, pp. 215-227. 



4. Mental Efficiency and Health: Robt. MacDougall, Sci.,. 

 vol. XIX, pp. 893-896. 



5. Cerebral Hygiene and Economy in Student Life: 

 O'Shea, Aspects of Mental Economy, chap. 2, pp. 64-72. 



6. The Energies of Men: Wm. James, Sci., March 1, 1907^ 

 vol. XXV, No. 635, pp. 321-332. 



III. FOOD AND AIR IN THE PRODUCTION AND CONSER- 



VATION OF ENERGY: 



1. Introductory Study of the Psychology of Foods: San- 

 ford Bell, Ped. Sem., 1904, vol. XI, pp. 51-90. 



2. Relative Value of Foods in Production of Nervous 

 Energy: O'Shea, Aspects of Mental Economy, chap. 3, 

 pp. 73-106. 



3. Fresh Air, Exercise and Rest in Production and Ex- 

 penditure of Cerebral Energy: O'Shea, Aspects of Men- 

 tal Economy, chap. 8, pp. 153-169. 



4. Preparation of Foods and Meal Hours in Generation of 

 Nervous Energy: O'Shea, Aspects of Mental Economy, 

 chap. 5, pp. 126-138. 



