APPENDIX c. 255 



Chapter X. — Potted plants of oxalis and sensitive plants, sun- 

 flower seedlings a foot or more Mgh 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, etc. (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 XV. — 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 XF///. — Flowers of hazel, alder, pine grasses (wind- 

 fertilized), insect-fertilized flowers from list in § 211. 



Chapter XIX. — Fruits of tomato, lemon, bean, dock. 



Chapter XX. — Fruits of ash, elm, or njaple, of milkweed, of 

 burdock, cocklebur, or beggar's ticks (Bidens), of cherry, or straw- 

 berry.i 



Chapter XXIII. — 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 iu 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, Eutgers College, New Brunswiclc, New Jersey, 

 will furnish sets of 100 weeds and of 100 weed-seeds and fruits at $10 per set ; $20 

 for the two sets. 



