XX 



STKOPSIS 



OBSERVATION PAGE 



XIX. Disguises of leaves, concluded (113-118(1) 103 



XX. The attachment of the leaf, and the insertion of the 



petiole (119-126) HO 



XXI. The forms of leaves (127-133a) 115 



XXII. Variation in leaves on the same plant, and on different 



plants of the same kind (134-138) • • • -122 



PART III 

 Studies of Flowers (pages 131-249) 



XXIII. What is a flower ? (139-146).. 131 



XXIV. What is a flower? concluded (147-152) 135 



XXV. The parts of the pistil (153-1596) 139 



XXVI. The stamens (160-165) .145 



XXVII. The insertion of the flower (166-170) 150 



XXVIII. Reinforced flowers (171-175) 152 



XXIX. Diclinous flowers ("176 -183a) 156 



XXX. Diclinous flowers, continued (184 188) 163 



XXXI. Diclinous flowers, concluded (189-193) 168 



XXXII. The dandelion (194-200) . 171 



XXXIII. The compositous tribes (201-208) 177 



XXXIV. Forms of the perianth (209-213) . .... 183 

 XXXV. The arrangement of the flowers (214-221(i) 188 



XXXVI. The arrangement of the flowers, concluded (222-227) . 193 



XXXVII. The kinships of the flower (228-285a) . . . . 197 



XXXVIII. Particular types of flowers ('236-240a) . . 206 



XXXIX. Particular types of flowers, continued (241-247a) . . .209 



XL. Particular types of flowers, continued (248-253) 215 



XLI. Particular types of flowers, continued (the orchids) 



(254- 258c) . . .222 



XLII. Particular types of flowers, continued ( grass-like 



plants) (259-263a) .... .226 



XLIII. Particular types of flowers, concluded (sedges) (264-268) 230 



XLIV. Cross-fertilization (269-276) . . 234 



XLV. Cross-fertilization, concluded (277-281) . 239 



XL VI. The crossing of plants (282-288) 246 



