RELATIVE STIMULATING EFFICIENCY OF LIGHT 175 



KRIES, J. v. 1905 NageFs Handbuch der Physiologie des Menschen, iii, 230-256. 



KRIES, J. v. 1907 Ueber die zur Erregung des Sehorgans erf orderl ichen Energie- 

 mengen. Zeitschr. f. Sinnesphysiol., xli, 373-394. 



KRON, E. 1913 Ueber das Schwarzungsgesetz photographischer Trockenplat- 

 ten. Ann. der Phys., xli, 751-758. 



KUNKLE, A. J. 1874 Ueber die Abhangigkeit der Farbenempfindung von der 

 Zeit. Pfliiger's Archiv., ix, 197. 



LOEB, J. 1907 Concerning the theory of tropisms, J. Exp. Zool., iv, 151-156. 



LOEB, J. 1918 Forced movements, tropisms, and animal conduct. Philadel- 

 phia, pp. 209. 



LOEB, J., AND EWALD, W. F. 1914 Ueber die Giiltigkeit des Bunsen-Rosco- 

 eschen Gesetzes fur die heliotropische Erscheinung bei Tieren. 

 Centr. Physiol., xxvii, 1165-1168. 



LOEB, J., AND NORTHRUP, JOHN H. 1917 Heliotropic animals as photometers on 

 the basis of the Bunsen-Roscoe law for heliotropic reactions. Pro- 

 ceedings of the National Academy of Sciences, iii, no. 9, 539-544. 



LOEB, J., AND WASTENAYS, H. 1917 A reexamination of the applicability of the 

 Bunsen-Roscoe law to the phenomena of animal heliotropism. Jour. 

 Exp. Zool., xxii, 187-192. 



LUMMER, O., u. BRODHUN, E. 1896 Photometrische Untersuchungen. VI. 

 Verwendung des Talbot'schen Gesetzes in der Photometric. Ztschr. 

 fur Instr.-kunde, xvi, 299-307. 



MARTIUS, GOTZ 1902 Ueber die Daur der Lichtempfindungen, Beitrage zur 

 Psychologic u. Philosophie, Leipzig, i, Heft 3. 



MAST, S. O. 1907 Light reactions in lower organisms. II. Volvox. Jour. 

 Comp. Neur. and Psych., xvii, 99-180. 



MAST, S. O. 1910 Reactions to light in marine turbellaria. Carnegie Institute 

 of Washington. Year Book No. 9, pp. 131-133. 



MAST, S. O. 1911 Light and the behavior of organisms. New York, pp. 378. 



MAST, S. O. 1914 Orientation in Euglena with some remarks on tropisms. 

 Biol. Cent., xxxiv, 641-674. 



MAST, S. O. 1915 What are tropisms? Arch. f. Entw. Mech., xli, 251-263. 



MAST, S. O. 1916 The process of orientation in the colonial organism Gonium 

 pectorale and a study of the structure and function of the eye spot. 

 Jour. Exp. Zool., xx, 1-17. 



McDouoALL, W. 1904 The variation of the intensity of visual sensation with 

 the duration of the stimulus. The British Journal of Psychology, i, 

 pt. 2, 151-189. 



NEWCOMER, H. S. 1919 The relation of the sector opening of the sector photom- 

 eter to the extinction coefficient. Science, n. s., xliv, 241-243. 



PARKER, G. H. 1903 The phototropism of the mourning cloak butterfly. Mark 

 Anniversary Volume, 453-469. 



PARKER, G. H., AND PATTEN, B. M. 1912 The physiological effect of intermit- 

 tent and continuous lights of equal intensities. Am. Jour. Physiology, 

 xxxi, no. 1, 22-29. 



PATTEN, B. M. 1914 A quantitative determination of the orienting reaction 

 of the blowfly larva (Calliphora erythrocephala Meigen). J. Exp. 

 Zool., xvii, 213-280. 



