X 
CONTENTS. 
CHAPTER III. 
Morphology of the External Conformation of Plants. 
PAGE 
Sect. 20. Difference between Members and Organs. Metamorphosis . . .149 
„ 21. Leaves and Leaf-forming Axes . . 153 
„ 22. Hairs (Trichomes) ........... 160 
„ 23. The Root 162 
„ 24. Different Origin of Equivalent Members . . . . . . .169 
„ 25. Different Capacity for Development of the Members of a Branch-system . 176 
„ 26. The Relative Positions of Lateral Members on a Common Axis . .187 
„ 27. Directions of Growth . . . . . 202 
28. Characteristic Forms of Leaves and Shoots ...... 2ir 
,5 29. Reproduction; Sexual Organs; Alternation of Generations . . . 222 
BOOK II. 
SPECIAL MORPHOLOGY 
AND OUTLINES OF CLASSIFICATION. 
Group 1. Thallophytes . . . .231 
Class I. Protophyta 245 
„ 2. Zygosporeae 250 
„ 3. Oosporeae _ . 267 
„ 4. Carposporeae 284 
Group II. Muscineaa 342 
Class 5. Hepaticae 346 
„ 6. Musci 361 
Croup III. Vascular Cryptogams 385 
Class 7. EquisetinesE ......... 392 
„ 8. Filicineae 409 
„ 9. Dichotomeae 460 
Group IV. Phanerogams 486 
Class 10. Gymnosperms 498 
Sub-group. Angiosperms 534 
Class II. Monocotyledons . .618 
„ 12. Dicotyledons 633 
