viii Publications of the University of Pennsylvania. 



SERIES IN 



Astronomy. 



Yol. I— No. I. (In Preparation.) 



Description and ;Determination of the Longitude of the Flower 

 Astronomical Observatory. By Charles L. DoouTfLE, C. E., 

 Sc. D., Director, and Professor of Astronomy. 



Vol. I— No. 2. (In Press.) 



Results of Observations with the Zenith Telescope, from October 

 I, 1896, to August 16, i898. By Charles L. Doolittle, C. E., 

 Sc. D. , Professor of Astronomy. 



SERIES IN 



Botany. 



Vol. II-No. I. 



1. Observations on Conopholis Americana. By Lucy L. W. Wilson, 



Ph. D., Head of the Biological Department, Philadelphia Normal School 

 for Girls. (With Plates I-VI.) 



2. Recent Observations on Amphicarpaea Monoica. By Adeline F. 



Schively, Ph. D., Honorary Fellow in Botany. 



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



from Mexico. By John W. Harshberger, Ph. D., Instructor in 

 Botany. (With Plates VH-VHI.) 



4. Structure and Development of Internal Phloem in Qelsemium 



Sempervirens, Ait. By Caroline B. Thompson, B. S. (With 

 Plate IX.) 



5. Structure of the Cork Tissues in Roots of some Rosaceous 



Genera. By Martha Bunting, Ph.D. (With Plate X.) 

 6: Comparative Studies on the Rate of Circumnutation of some 

 Flowering Plants. By Elizabeth A. Simons. 



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



Randolph E. B. McKenney, B. S. (With Plate XI.) 



8. Observations on some Hybrids between Drosera filiformis 



and D. intermedia. By John M. Macfarlane, D. Sc, Professor of 

 Botany. (With Plate XII.) 



9. Statistical Information concerning the Production of Fruits 



and Seeds in Certain Plants. By John W. Harshberger, Ph. D., 

 Instructor in Botany. 



