List of Illustrations 
Frontispiece, May-apple (Podophyllum peltatum). 
FIG. 
I. 
2a. 
26. 
3a. 
35. 
4. 
5. 
PAGE 
Golden crocus (Crocus aurens), with analysis of the 
flower..... wiih See seule 's vs ancalem wilds iat stisbeue stare tuioreda ate deta <x) - 20 
Calyces of differing forms, Fox-glove, aconite, fuchsia, 
valerian, flax, and loose-strife...........ccec cece ees 21 
Corollas of various form, Tobacco-plant, lilac, sage, 
arbutus, pea, convolvulus, pink, and geranium...... 23 
A pollen grain of the melon (much magnified).......... 24 
Pollen grains of the European hazel (Corylus Avellana) 
putting forth their pollen tubes............. aie ee sate 26 
Florets and fruits of the dandelion.............+.-.05- 41 
Some altered calyces of composite flowers. Groundsel 
calyx altered intodown. Bur marigold calyx altered 
into prongs. Orange hawk-weed calyx altered into 
bristles (all magnified)..........6..c ese e eee ee eeeee 46 
Fruit of the elm......... Marghaedaciews Maeaweene Siena 50 
(2) Sleeping and (4) expanding buds of the Anise chest 
NUCsaeed caiee deed eleuruewaees vag ode ee eet aise dbo 55 
Apple twig showing old bud-scale marks....... seecene 58 
Blossoms of the butternut.......... ccc cece eee e ee eeee . 67 
Blossoms of the oak (a) pistillate, (4) staminate........ 70 
Details of the blossoming butternut, (2) A cluster of 
pistillate flowers, (6) one stamen bearing scale de- 
tached from the staminate flower-chain, (c) a single 
STAMEMN. cere eee reece eee e ewer e nce ee ere san ceeees + 72 
Buds of the ash.............005 Sid eG ne asleeraenme cites 76 
Perfect (a) staminate (4) and pistillate (c) flowers of the 
European ash (fraxinus excelsior)...+..++ daeweeee 77 
Young horse-chestnut bur and young acorns........ -. 83 
Twinned fruit of the maple...........ece ee ceeeeeeeeee 85 
Magnified section of the green tissue of a leaf......... go 
