300 
IOWA ACADEMY OF SCIENCE Voi.. XXVII, 1920 
5. E. P. Lyon, Amer. Jour. Physiol., vol. 11, p. 52, 1904. 
6. A. R. Moore, Biol. Bull., vol. 28, p. 257, 1915. 
7. R. S. Lillie,, Jour, Exper. Zool., vol. 21, no. 3, p. 401, 1916. 
8. M.-Herlant, Comptes rendus d. 1. Societe’ d. Biologic, vol. 81, p. 151, 
1918. 
9. R. S. Lillie, Biol. Bull., vol. 17, p. 207, 1909. 
10. R. S. Lillie, Amer, Jour. Physiol., vol. 45, no. 4, p. 406, 1918. 
11. R. S. Lillie, Jour. Biolog. Chem., vol. 17, no. 4, pp. 129-30, 1914. 
12. Cf. reference just cited; table VIII,, p. 135. 
13. Cf. reference just cited; table IX., p. 137. 
14. H. Fiihner, Arch. f. exp. Path. u. Pharm., Hi, p. 69, 1904. 
15. Capryl alcohol used in exposure of five minutes seemed not to obey 
this general rule, since in practically all experiments it was used in 
concentrations nearly three times its computed strength. (See p. 
296.) 
16. R. S. Lillie, Jour. Biol. Chem., vol. 17, no. 2, p. 130, 1914. 
17. See ibid, p. 133. 
Department oe Zoology, 
Iowa State College. 
