178 THE NATURE OF ANIMAL LIGHT 



Welker, W. H.: 1912, Diffusibility of Protein Through Rubber Membranes 



with a Note on the Disintegration of Colloidian Membranes by Common 



Ethyl Ether and Other Solvents. Biochem. Bull., vol. ii, p. 70. 

 Wheeler, W. M., and Williams, F. X.: 1915, The Luminous Organ of the 



New Zealand Glowworm. Psyche, vol. xxii, pp. 36-43. 

 Weidemann, E.: 1888, Ueber Fluorescenz und Phosphorescenz. Wied. Ann. 



d. Phy. u. Chem., vol. xxxiv, pp. 446-469. 

 Wiedemann, E., and Schmidt, G. W. : 1895a, Ueber Luminescenz. Wied. 



Ann. d. Phy. u. Chem., vol. liv, pp. 604-625; 1895b, vol. Ivi, pp. 201-254. 

 Wielowiejski, H. R. v.:' 1882, Studien ueber die Lampyriden. Ztschr. f. 



toiss. ZooL, Bd. xxxvii, pp. 354-428. 

 Williams, F. X.: 1916, Photogenic Organs and Embryology of Lampyrids. 



Journ. Morph., vol. xxviii, pp. 145-186. 

 Yatsu, N. : 1917, Note on the Structure of the Maxillary Gland of Cypri- 



dina hilgendorfii. Journ. Morph., vol. xxix, pp. 435-440. 

 Young, C. A. : 1870, The Spectrum of the Firefly. Amer. Nat., vol. iii, p. 615. 

 Zacharias, O. : 1905, Beobachtungen ueber das Leuchtvermogen von Cera- 



tium tripos. Biol. Cthl., Bd. xxv, pp. 20-30. 



