LIST OF ILLUSTRATIONS XV 
FIGURE PAGE 
159. Diagram of Body of Starfish ....... 170 
160. Embryo of Starfish ..171 
161. Purple Sea-urchin.172 
162. Common Sea-cucumber . 173 
163. Planarian Worm ..175 
164. Trichinella. .... 176 
165. Common Tapeworm ..177 
166. Hair Worm in Body of Grasshopper.178 
167. Organs of the Earthworm.181 
168. Nervous System of Earthworm. 182 
169. Dero.183 
170. Clam, Showing Foot.185 
171. Left Shell of Clam.186 
172. Digestive Tube of Clam. 187 
173. Embryo of Clam.188 
174. Snail.189 
175. Our Common Pond Snail. . 189 
176. Tongue of Snail.190 
177. Snail Shells.190 
178. Soft-shelled Clam.191 
179. Octopus ..191 
180. Stages in Life History of Oyster.192 
181. Barnacles and Clams Growing on Oysters.193 
182. Flower of Nasturtium.. . 198 
183. Flower of Nasturtium with Petals Removed .... 199 
184. Pistil and Stamen of Nasturtium.199 
185. Flower of Lily.200 
186. Stamen of Lily . 200 
187. Staminate Flowers of Corn, the “Tassel” .... 203 
188. Pistillate Flowers of Corn ..204 
189. Violet Plant with Cleistogamous Flowers.205 
190. Disk Flower of Daisy.206 
191. Ray Flower of Daisy.206 
192. Flower and Fruit of Dandelion.207 
193. Flower of Salvia . ..209 
194. Salvia.210 
195. Pollen Grain Sprouted.210 
196. Pollen Grains Sprouting and Growing through Style . .211 
197. Pollen Tube, Enlarged.211 
198. Pollen Tube Entering Ovule in Act of Fertilization . . .212 
199. Umbel.213 
