CONTENTS OF VOLUME IV, No. 2 



Water Content {in4 Transpirfition of Leaves. By A^sh^ W. Clark, PH.p 105 



Chasmogamic and Cleistogamic Flowers of Impatiens Fuiva. By Franidin E. 



Carroll, M.A., ph.d. (With Plates LV-LVII) 'l44 



The Comparative Histology' and Irritability of Sensitive Plants. By D. Waltear 



Steckbeck, a.m., ph.d., (With Plates LVIII-LXV) 185 



Observations oh the Beach Plum. By John Young Pennypacker, a.m., ph.d. 



(With Plates LXVI-LXX) 231 



Production of New Cell Formations in P lants. By William R. Taylor, B.s., 

 M.S. (With Plates LXXI-LXXVIII) 271 



The Peanut, its History, Histology, Physiology and Utility. By Ralph A. Wal- 



dron, B.S., M.S. (With Plates LXXXIX-LXXX) : 301 



The Comparative Morphology, Taxonomy, and Distribution of the Myricaceae 

 of the Eastern United States. By Heber W. Youngken, a.m., m.s., ph.d. 

 (With Plates LXXXI-XC) 339 



A Comparative Study of Floerkea Proserpinacoides and Allies. By Alice M. 



Russell, B.S., M.S. (With^ Plates XCI-XCII) 401 



Biochemical Studies of Insectivorous Plants. 



I. The Work of Previous Investigators on Nepenthes. By Joseph S. 



Hepburn, a.m., m.s.,* ph.d 419 



II. A Study of the Protease of the Pitcher Liquor of Nepenthes. By 



Joseph S. Hepburn, a.m., m.s., ph.d 442 



III. A Bacteriological Study of the Pitcher Liquor of Nepenthes. By Jo- 



seph S. Hepburn, ph.d., and E. Qumtard St. John, m.d 451 



IV. Antiproleases in the Larvae of the Sarcophaga Associates of Sarracenia 



flava. By Joseph S. Hepburn and Frank M. Jones 460 



