XIV LIST OF ILLUSTRATIONS 
FIGTXKE PAGE 
118. International Champion Draft Horse . . . . . 128 
119. Standard Breed of Trotting Horse ...... 129 
120. Deer Mouse . . ..129 
121. Holstein Cow and Calf.130 
122. Prize Hereford Bull.131 
123. Hampshire Sheep ......... 132 
124. Rambouillet Sheep.133 
125. Berkshire Pigs.134 
126. Camel.135 
127. Bison. . 136 
128. A Beaver Dam. . 136 
129. Poplar Trees Cut Down by Beavers ...... 137 
130. Beaver House.138 
131. Runways of Muskrats ........ 139 
132. Photomicrograph of Amoeba ....... 142 
133. Diagram of Amoeba. 143 
134. Fission of Amoeba.• 145 
135. Diagram of Paramecium.146 
136. Paramecium .......... 147 
137. Paramecium Stained to Show Nucleus ..... 147 
138. Paramecium Reproducing by Fission ..... 148 
139. Vorticella.148 
140. One of the Foraminifera ........ 149 
141. Some Flagellate Protozoa.149 
142. Gonium.152 
143. Volvox.153 
144. Bath Sponge.154 
145. Grantia, Showing Parts.155 
146. Sponge Development . . . - . . . . 157 
147. Sponge Spicules , 157 
148. Fresh-water Hydras . . .161 
149. Diagram of Body of Hydra. . 162 
150. Cross Section Body-wall of Hydra ...... 162 
151. Photomicrograph of Hydra, Showing Eggs .... 163 
152.. Photomicrograph of Colonial Hydroid ..... 164 
153. Hydroid Colony . . . . \ .. . . . 165 
154. Medusa Known as Pelagia . . . . . . 165 
155. Medusa of Hydroid . . ..165 
156. Pennaria Tiarella.166 
157. Somp Common Corals ........ 167 
158. Starfish.169 
