CONTENTS. XXI 



PAGE 



Torsion of Twining Stems Part 6 917 



Structure and Growth of Palms „ 917 



Honey-glands of Cruciferce „ 918 



Resin-deposits .. ,, 918 



Distribution of Food-materials in the Plant „ 918 



Transpiration of Plants in the Tropics „ 919 



Chemical Phenomena of the Assimilation of Plants .. .. „ 919 



Histo- Chemistry of Plants „ 919 



Pure Chlorophyll „ 920 



Lime and Magnesia in Plants . . ,, 920 



Easily OxidizaUe Substances in Plant Sap ,, 921 



Action of Nitrous Oxide on Vegetation „ 921 



Silicification of Organs „ 921 



Influence of Solar Bays on the Temperature of Trees .. „ 921 



Thermic Constants in Plants „ 921 



Chemical Changes in their Relation to Micro-organisms .. ,, 922 

 Comparative Morphology of the Leaf in Vascidar Crypto- 

 gams and Gymnosperms „ 922 



Worthington Smith on Diseases of Field and Garden Crops „ 935 



B. — Oryptogamia. 

 Cryptogamia Vascularia. 



Development of Marsilea Part 1 29 



Classification of OphioglossacecB „ 92 



Structure of Helminthostachys „ 92 



Fructification of Fossil Ferns Part 2 261 



Prothallium of Struthiopteris germanica „ 262 



Stigmaria Part 3 417 



Homology of the Reproductive Organs in Phanerogams and 



Vascular Cryptogams Part 4 581 



Origin of Roots in Ferns „ 592 



Monograph of IsoetcB „ 593 



Systematic Position of Lepidodendron, Sigillaria, and 



Stigmaria , 593 



Anatomy of Vascular Cryptogams Part 5 781 



Fertilization of Azolla „ 781 



Comparative Morphology of the Leaf in Vascular Cryp- 

 togams and Gymnosperms Part 6 922 



Apex of the Letif in Osmunda and Todea „ 923 



Rabenhorst's Cryptogamic Flora of Germany (Vascular 



Cryptogams) „ 924 



Muscineee. 



Structure and Development of certain Spores Part 1 93 



Mucilage- Organs of MarchantiacecB Part 2 262 



Cephalozia Part 3 417 



Variations in Sphagnum Part 4 594 



Male Inflorescence of Mosses Part 5 781 



Lesquereux and James's Mosses of North America .. . . „ 782 



Braithwaite's British Moss Flora ., Part 6 924 



Hobki'rk's British Mosses .. „ 924 



