VI 
Contents . 
PAGE 
Kny, L. — On Correlation in the Growth of Roots and Shoots . . 265 
Strasburger, E. — The Periodic Reduction of the number of the 
Chromosomes in the Life-History of Living Organisms . . 281 
Pfeffer, W. — Geotropic Sensitiveness of the Root -tip . . *317 
Wager, H. — On the Presence of Centrospheres in Fungi. (With 
Plate XVII) 321 
Holmes, E. M. — New Marine Algae. (With Plate XVIII) . . 335 
Bower, F. O. — A Theory of the Strobilus in Archegoniate Plants . 343 
NOTES. 
Williams, J. Lloyd. — T he Sieve-tubes of Calycanthus occidentalis. 
(With Woodcut 2) 367 
Green, J. R. — The Influence of Light on Diastase .... 370 
Humphrey, J. E.— Nucleoli and Centrosomes 373 
No. XXXII, December, 1894. 
Davis, B. M. — Euglenopsis : a New Alga-like Organism. (With 
Plate XIX) 377 
Mottier, D. M. — Contributions to the Life-History of Notothylas. 
(With Plates XX and XXI) 391 
Newcombe, F. C. — The Cause and Conditions of Lysigenous Cavity- 
formation .......... 403 
Spalding, V. M. — The Traumatropic Curvature of Roots. (With 
Plate XXII) 423 
Wright, C. H. — On the Double Flower of Epidendrum vitellinum, 
Lindl. (With Plate XXIII) 453 
Johnson, T. — Two Irish Brown Algae : Pogotrichum and Litosiphon. 
(With Plate XXIV) . . 457 
NOTES, 
Bower, F. O. — On Apospory and Production of Gemmae in Tri- 
chomanes Kaulfussii, Hk. and Gr. (With Woodcuts 3, 4, 
and 5) 465 
Dixon, H. H. and Joly, J. — On the Ascent of Sap .... 468 
