368 HENRY LAURENS AND HENRY D. HOOKER, JR. 



Hyde, E. P., Forsythe, W. E., and Cady, F. E. 1918 The visibility of radia- 

 tion. Astrophysical Jrl., vol. 48, pp. 65-88. 



Ives, H. E. 1912 The spectral luminosity curve of the average eye. Phil. 

 Mag., S. 6, vol. 24, pp. 853-863. 



Laurens, H., and Hooker, H. D-., Jr. 1917 Studies on the relative physio- 

 logical value of spectral lights. I. Apparatus. Amer. Jrl. Physiol., 

 vol. 44, pp. 504-516. 



1918 The relative sensitivity of Volvox to spectral lights of equal 

 radiant energy content. Anat. Rec, vol. 14, pp. 97-98. 



LoEB, J., AND Wasteneys, H. 1916 The relative efficiency of various parts 

 of the spectrum for the heliotropic reactions of animals and plants. 

 Jour. Exp. Zool., vol. 20, pp. 217-236. 



Loeb, J. 1918 Forced movements, tropisms and animal conduct. Lippincott. 



LucKiESH, N. 1917 The physical basis of color-technology. Jrl. Franklin 

 Institute, vol. 184, pp. 73-94, 227-250. 



Mast, S. O. 1907 Light reactions in lower organisms. II. Volvox globator. 

 Jrl. Comp. Neur. and Psychol., vol. 17, pp. 99-180. 

 1911 Light and the behavior of organisms. John Wiley & Sons. 

 1917 'The relation between spectral color and stimulation in the 

 lower organisms. Jour. Exp. Zool., vol. 22, pp. 471-528. 



Nutting, P. G. 1908 The luminous equivalent of radiation. Bull. Bur. Stand- 

 ards, vol. 5, pp. 261-308. 

 1915 The visibility of radiation. Phil. Mag. , S. 6, vol. 29, pp. 301-309. 



Parsons, J. H. 1915 An introduction to the study of colour vision. Putnam's 

 Sons. 



Reeves, 'P. 1918 The visibility of radiation. Trans. Ilium. Engineer Soc, 

 vol. 13, pp. 101-109. 



Sheppard, S. E. 1914 Photo-chemistry. Longmans. 



Thurmel, E. 1910 Das Lummer-Pringsheimschen Spectralfiickerphotometer 

 als optisches Pyrometer. Ann. d. Physik., Bd. 33, S. 1139-1160. 



Trendelenburg, W. 1904 Quantitative Untersuchungen uber die Bleichung 

 des Sehpurpurs in monochromatischem Licht. Zeitschr. f. Physiol, d. 

 Sinnesorg., Bd. 37, S. 1-55. 



Troland, L. T. 1916 Apparent brightness: its conditions and properties. 

 Trans. Ilium. Eng. Soc, vol. 11, pp. 947-966. 



1917 The nature of the visual receptor process. Jrl. Optical Soc. of 

 America, vol. 1, pp. 3-15. 



