CONTENTS. 
PAGE 
Vines, S. H. — The Proteases of Plants. VI ..... i 
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-I II . . 19 
Beer, Rudolph. — On Elaioplasts. With Plate IV . . . .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 7 3 
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 . . . „ 0 . . .117 
Wilson, Malcolm. — On 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 
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