vi Publications of the University of Pennsylvania. 



2. Recent Observations on Amphicarpeea monoica. By Adeline F. 



SCHiVELY. 



3. Water Storage and Conduction in Senecio Prgecox, D. C, 



from Mexico. Hy John W. Hakshherghr. 



4 Structure of the Cork Tissues in Roots of some Rosaceous 

 Qenera. (With Plates.) By Martha Bunting. 



5. Structure and Development of Internal Phloem in Qelsemium 



Sempervirens, Alt. By Caroline B. Thompson. 



6. Comparative Studies on the Rate of Circumnutation of some 



Flowering Plants. By Elizabkth A. Simons. 



7. Observations on the Development of some Embryo'sacs. By 



Randolph E. B. McKenney. 



8. The Occurrence and Structure of Hybrids between Drosera 



fiiiformis and D. intermedia. iJy John M. Macfarlane. 

 9 Statistical Information on the Production of Fruits and Seeds 

 in Certain Plants. By John VV. Harshbergkr. 



Volame II.— Number 2. $2.00. 



1. Observations on Aphyllon uniflorum. By Amelia Smith. (Plates 



XIII, XIV, XV.) 



2. The Comparative Structure of the Flowers of Polygala poly- 



gama and P. pauciflora, with Observations on Cleistogamy. 



By Charles H. Shaw. (Plates XVI-XVII.) 



3. Observations on Growth and Cell Division in the Root of Vicia 



Faba. By Blanche Gardner. (Plate XVIII.) 



4. Current Problems in Plant Cytology. By J. M. Macfarlane. 



5. Fasciation in the Sweet Potato. By Henry S. Conard. (Plate 



XIX.) 



6. The Beach Plum Botanically and Economically Considered. 



By John M. Macfarlane. (Plates XX, XXI, XXII.) 



7. A Study of the Fertile Hybrids Produced by Crossing Teo- 



sinte and Maize. By John W. Harshbhrger. 



Zoology 



[See Note.} 



Volume I— No. i. $2.00. 



I. The Correlations of the Volumes and Surfaces of Organisms. 



By John A. Ryder. (Plate I.) 



The Growth of Euglena Viridis when Constrained Principally 

 to Two Dimensions of Space. By John A. Ryder. (Plate II.) 



3. 



