CONTENTS. 
No. LXXXIX, January, 1909. 
PAGE 
Vines, S. H. — The Proteases of Plants. VI 1 
Overton, J. B. — On the Organization of the Nuclei in the Pollen Mother-cells of certain 
Plants, with especial Reference to the Permanence of the Chromosomes. With 
Plates I— III 19 
Beer, Rudolph. — O n Elaioplasts. With Plate TV 63 
Oliver, F. W. — On Physostoma elegans, Williamson, an archaic Type of Seed from the 
Palaeozoic Rocks. With Plates V-VII, and ten Figures in the Text . . . 73 
Brenchley, W. E. — On the Strength and Development of the Grain of Wheat (Triticum 
vulgare). With Plates VIII and IX, and five Figures .in the Text . . . . 117 
Wilson, Malcolm. — O n Spore Formation and Nuclear Division in Mnium hornum. With 
Plates X and XI 141 
NOTES. 
Horne, A. S. — Discharge of Antherozoids in Fossombronia and Haplomitrium Hookeri. 
With three Figures in the Text . . . .159 
Ballantine, A. J. — A Preliminary Note on the Embryo-sac of Protea Lepidocarpon, R.Br. . 161 
No. XC, April, 1909. 
Lawson, A. A. — The Gametophytes and Embryo of Pseudotsuga Douglasii. With Plates 
XII, XIII, and XIV 163 
Harvey, H. W. — The Action of Poisons upon Chlamydomonas and other vegetable Cells. 
With two Figures in the Text 181 
Hill, T. G., and de Fraine, E. — On the Seedling Structure of Gymnosperms. II. With 
Plate XV, and eleven Figures in the Text . .189 
Salisbury, E. J. — The Extra-floral Nectaries of the Genus Polygonum. With Plate XVI, 
and six Figures in the Text 229 
Massee, G. — The Structure and Affinities of British Tuberaceae. With Plate XVII . . 243 
Sargent, O, H. — Notes on the Life-History of Pterostylis. With Plates XVIII and XIX . 265 
Yapp, R. H. — On Stratification in the Vegetation of a Marsh, and its Relations to Evaporation 
and Temperature. With Plate XX, and eight Figures in the Text . . . -275 
Shaw, F. J. F. — The Seedling Structure of Araucaria Bidwillii. With Plate XXI, and six 
Diagrams in the Text 321 
NOTES. 
Massee, G. — On a new Genus of Ascomycetes. With three Figures in the Text . . . 335 
Kershaw, E. M. — Note on the Relationship of the Julianiaceae. With two Figures in 
the Text 336 
Ridley, H. N. — Branching Palms . . . . . . . . . . *337 
Chandler, B. — Note on Utricularia emarginata, Benj. With Plate XXII .... 339 
Sykes, M. G. — On the Nuclei of some Unisexual Plants 340 
