REACTIONS OF LARY.E TO LIGHT. 2J3 



noted that in the majority of cases the wave-lengths which he 

 found to be most stimulating were among those transmitted by 

 the blue-green Wratten Light Filter No. 75, which was most 

 stimulating for Paltzmonetes and Loligo. The blue-green region 

 was also found to be maximum in stimulating efficiency for a con- 

 siderable number of different forms by Strasburger (1878), 

 Engleman (1882), Yerworn (1889), Wilson (1891), Gross (1913), 

 Loeb and Wasteneys (1916), Laurens and Hooker (1920), 

 Hecht (1921), and others. Various longer waves were, however, 

 found to be most efficient in other species by Bert (1869), Lubbock 

 (1991), Engelman (1882), Hess (1910), Loeb and Maxwell (1910), 

 and others. It would appear, therefore, that the distribution of 

 stimulating efficiency in the spectrum is not necessarily the same 

 for all species having light-perceptive powers. 



LITERATURE. 



Since Mast (1917) has an extended bibliography of work to the date of publica- 

 tion of his paper, the list will not be repeated here. 

 Hecht, S. 



'21 The Relation between the Wave-length of Light and its Effect on the 



Photosensory Process. Jour. Gen. Physiol., Vol. 3, pp. 375-390. 

 Laurens, H., and Hooker, H. D., Jr. 



'20 Studies on the Relative Physiological Value of Spectral Lights. II. The 

 Sensibility of Volvox to Wave-lengths of Equal Energy Content. Jour. 

 Exper. Zool., Vol. 30, No. 3, pp. 345-368. 

 Mast, S. O. 



'07 Light Reactions in Lower Organisms. II. Volvex. Jour. Comp. Neur. 



and Psych., Vol. 17, pp. 99-180. 



'17 The Relation between Spectral Color and Stimulation in the Lower Organ- 

 isms. Jour. Exper. Zool., Vol. 22, pp. 471-538. 



