rs, 419--Enlargement of buds, 420--Of
flower-stalk, 421--In pears, 423--Of placenta, 424--Of leaves,
426--Development of parts usually abortive, 427--Enlargement of
perianth, 428--Of androecium, 430--Of gynoecium, 430--Of
fruit, 431--Alterations of consistence, 432.

CHAPTER II.

ELONGATION 488

Elongation of root, 434--Of inflorescence, 434--Of
flower-stalks, 435--Of leaves, 437--Of parts of flower, 438--Of
thalamus and placenta, 440--Apostasis, 440.

CHAPTER III.

ENATION 443

Excrescences from axile organs, warts, 444--Enation from leaves,
445--From sepals, 448--From petals, 448--Catacorolla,
451--Enation from stamens, 453--From carpels, 453.

PART II.--ATROPHY 454

CHAPTER I.

ABORTION 455

Abortion of axile organs, 455--Of receptacle, 457--Of leaves,
458--Of perianth, calyx, and corolla, 460--Of stamens, 463--Of
pollen, 463--Of pistil, fruit, &c., 464--Of ovules,
466--Depauperated ferns, 466--General remarks, 467.

CHAPTER II.

DEGENERATION 470

Formation of scales, 470--Of hairs, 472--Of glands, 473--Of
tendrils, 473.

GENERAL CONCLUSIONS.

General morphology of the leaf and axis, 476.--Homology,
476--Special morphology, 479--Calyx-tube, 480--Androecium,
482--Inferior ovary, 482--Placentation, 483--Structure of the
ovule, 484--Leaves of Conifers, 484--Relative position of
organs, 484--Law of alternation, 485--Co-relation,
486--Compensation, 488--Teratology and classification, 488.

APPENDIX.

Double flowers, varieties of, 491--Causes of production,
491--Relation to variegated foliage, 497--List of plants
producing, 499.

NOTE 508

INDEX TO SUBJECTS 511

INDEX OF NAMES OF PLANTS 517

LIST OF ILLUSTRATIONS.

FIG. PAGE

1. Diagram of regular pentamerous flower 4
2. Cohesion of branch _Dipsacus sylvestris_ 10
3. Fasciated lettuce ('Gard. Chron.') 11
4. Fasciation in _Asparagus_