APPENDIX CG. 255 
Chapter X. — Potted plants of oxalis and sensitive plants, sun- 
flower seedlings a foot or more high to show movement of leaves to 
secure sunlight. 
Chapter XI.— Droseras and Sarracenias, potted and growing 
under bell glass, a cactus, a houseleek or an aloe, an Echeveria or a 
Cotyledon. 
Chapter XII. — Fresh lily leaves, microscopical preparations (see 
list at end), fresh hydrangea or cucumber leaves, potted hydrangeas 
and rubber plants (§ 144), leaves of lettuce, hydrangea, maple, 
hickory, or cucumber (§ 145), Elodea, Fontinalis, Spirogyra, ete. (foot- 
note to § 149), growing nasturtium plants, early summer and late 
fall leaves of trees in alcohol. 
Chapter XIII.— Fresh flowers of any species of Tradescantia, or 
living Chara or Nitella in water. 
Chapter XIV.— Flower-clusters of various kinds. 
Chapter X V. — Flowers of trillium, tulip, or buttercup. 
Chapter XVI. — Imperfect flowers, as those of willow, poplar, 
walnut, birch, hazel, begonia. 
Chapter XVII. — Fresh pollen of Cytisus, sweet pea, or nastur- 
tium, mounted slide of pollen (see list at end). 
Chapter XVIII.— Flowers of hazel, alder, pine grasses (wind- 
fertilized), insect-fertilized flowers from list in § 211. 
Chapter XI X.— Fruits of tomato, lemon, bean, dock. 
Chapter XX.—Fruits of ash, elm, or maple, of milkweed, of 
burdock, cocklebur, or beggar’s ticks (Bidens), of cherry, or straw- 
berry. 
Chapter X XIII. — Protococcus (or Pleurococcus). Living speci- 
mens are best, but mounted slides will answer. Living Spirogyra, 
mounted slides of Spirogyra in conjugation, desmids (fresh or 
mounted), growing yeast, black mould growing, a mounted slide of 
zygospores of Mucor, Polytrichum in various stages of growth, a 
mounted slide of some moss protonema, whole fern plants (including 
rootstocks), fruiting fern fronds, fern prothallia (fresh, or mounted 
for the microscope). 
'1 Professor Byron D. Halsted, Rutgers College, New Brunswick, New Jersey, 
will furnish sets of 100 weeds and of 100 weed-seeds and fruits at $10 per set; $20 
for the two sets. 
