LIST OF ILLUSTRATIONS xvii 
FIGURE PAGE 
241. - Aerial Roots of Ivy.252 
242. Tap Roots of Radish.253 
243. Extent of Root System of Corn.253 
244. Root System of Alfalfa.254 
245. Root System of Rhubarb, a Medicinal Plant .... 255 
246. Effects of Inoculation on Garden Peas ..... 257 
247. Effect of Bacteria on the Growth of Red Clover in a Poor Soil . 258 
248. Stem of Indian Turnip 261 
249. Starch Grains, Highly Magnified.261 
250. Potato ..262 
251. Dandelion Plant.. 263 
252. Stem of Horse-chestnut.264 
253. Elms.265 
254. Wood of Spruce, Greatly Magnified.266 
255. Cross Section of Corn Stem.267 
256. Corn Stem . . . . . . . 268 
257. Cross Section of Dicotyledonous Stem.268 
258. Cleft Grafting.270 
259. Whip or Tongue Grafting.271 
260. Skeleton of Poplar Leaf.276 
261. Leaf of Elm.276 
262. Palmately Compound Leaf of Woodbine.277 
263. Bit of Epidermis of Leaf.283 
264. Cross Section of Bean Leaf ....... 285 
265. Leaves of Barberry . 288 
266. Peltate Leaf of Nasturtium ....... 288 
267. Twining Petiole of Clematis.289 
268. Indian Pipe ..290 
269. Leaves of Young Plants of Pokeweed.291 
270. Pea Plant.292 
271. Vertical Section of Cabbage.293 
272. Walnut Tree . 295 
273. Leaf of Oak.296 
274. Siliques of White Mustard.297 
275. Single Silique Split Open ........ 297 
276. Base of Rose Leaf ..298 
277. Stem of Rose 298 
278. Nodules Caused by Bacteria on Roots of Bean .... 299 
279. Peanut ....... ... 299 
280. Flower of Columbine.300 
281. Calla, a Flower with Spathe and Spadix.300 
