ILLUSTRATIONS 



PLATES. 



Page. 

 Plate I. Fig. 1. — Bromiis racemosu-% smooth brpme-grass. Fig. 2. — Bromus 



secalinus, cheat, or chess 22 



II. Fig. 1. — Alsine media, common chickweed. Fig. 2. — Rumex crispus, 



curled dock. Fig. 3. — Datura tdtula, jimson weed 22 



III. Fig. 1. — Eli/mas canadensis, nodding wild rye. Fig. 2. — Fraxinus 



americana, white ash. Fig. 3. — Phytolacca americand, poke 22 



TEXT FIGURE. 



Fig. 1 . Diagram showing order in which seeds were buried 10 



(3 



