476 L- V. HEILBRUXX. 



19. Weber. 



'21 Biochem. Zeitsch., CXXVI., 21. 



20. Heilbrunn. 



'20 BIOL. BULL., XXXIX., 307- 



21. Chambers. 



'24 The Physical Structure of Protoplasm as Determined by Micro-dissection 

 and Injection, in General Cytology, edited by E. V. Cowdry, Chicago. 



22. Heilbrunn. 



'21 Jour. Exp. Zool., XXXIV., 417- 



23. Heilbronn. 



'22 Jahrb. f. wiss. Bot., LXI., 284. 



24. Heilbrunn. 



'24 Amer. Jour. Physiol., LXIX., 190. 



25. Hyman. 



'23 BIOL. BULL., XLV., 254. 



