1.  F.B.  Gilbreth, Bricklaying System, para. 541-545.
 2.  H.K.  Hathaway, Prerequisites to the Introduction of Scientific
    Management, Engineering Magazine, April, 1911, p. 141.
 3.  H.L.  Gantt, paper 928, A.S.M.E., p. 372.
 4.  H.L.  Gantt, Work, Wages and Profits, p. 116.
 5.  H.L.  Gantt, paper 928, A.S.M.E., p. 342.
 6.  F.W.  Taylor, Shop Management, para. 289, Harper Ed.,
    pp. 127-128.
 7.  H.K.  Hathaway, Engineering Magazine, April, 1911, p. 144.
 8.  W.D.  Ennis, An Experiment in Motion Study, Industrial
    Engineering, June, 1911, p. 462.
 9.  C.S.  Myers, M.D., An Introduction to Experimental Psychology,
    chap.  V, p. 73.
10.  G. M. Stratton, Experimental Psychology and Culture, p. 125. 11.  William James, Psychology, Briefer Course, p. 171. 12.  F.B.  Gilbreth, Bricklaying System, chap.  I, Training of
    Apprentices.
13. McClure’s Magazine, May, 1911, Dec, 1911, Jan., 1912. 14.  As a woodman’s keenness of hearing. 15.  M.W.  Calkins, A First Book in Psychology, chap.  III. 16.  Stratton, Experimental Psychology and Culture, chap.  VII. 17.  Compare with an actor’s learning a part. 18.  As proved by experimenting with a six-year-old child. 19.  Imbert, Etudes experimentales de travail professionnel ouvrier,
    Sur la fatigue engendree par les mouvements rapides.
20.  William James, Psychology, Briefer Course, p. 134. 21. Ibid., p. 138.  William James, Psychology, Advanced Course.
    p. 112.
22.  F.B.  Gilbreth, Bricklaying System, p. 142. 23.  Stratton, Experimental Psychology and Culture, p. 214. 24.  Prof.  Bain, quoted In William James’ Psychology, Briefer
    Course, pp. 145-147.
25.  F.B.  Gilbreth, Bricklaying System, para. 18-19. 26.  M.W.  Calkins, A First Book in Psychology, p. 354. 27.  James Sully, The Teacher’s Handbook of Psychology, p. 119. 28.  Stratton, Experimental Psychology and Culture, p. 99. 29.  Stratton, Experimental Psychology and Culture p. 240. 30.  Attracting the attention is largely a matter of appealing to
    what is known to interest, for example, to a known ambition.
31.  M.S.  Read, An Introductory Psychology, p. 183. 32.  F.B.  Gilbreth, Motion Study, p. 89.
33. Ibid., Bricklaying System, para. 555-557.
34.  F.B.  Gilbreth, Bricklaying System, p. 150. 35.  M.S.  Read, An Introductory Psychology, pp. 179-194. 36.  G.M.  Stratton, Experimental Psychology and Culture, p. 42. 37.  M.S.  Read, An Introductory Psychology, p. 208. 38.  William James, Psychology, Advanced Course, Vol.  I, p. 667. 39.  M.S.  Read, An Introductory Psychology, pp. 212-213.  William
    James, Psychology, Briefer Course, p. 302.
40.  M.W.  Calkins, A First Book in Psychology,