XXU LIST OF ILLUSTRATIONS. 



FIG. PAGE 



147. Longitudinal section of the 20-feet Pond, No. 2, showing Collecting- 



box and Water-drain, . . . . . .196 



148. Longitudinal section of 60-feet Pond, . . .197 



149. Transverse section of 60-feet Pond, . . . 197 



150. Plan of 60-feet Pond, . . 198 



151. Plan of the Howietoun Hatching-house, . . . .218 



HOWIETOUN 1 30-FEET PONDS. 



152. Dividing-box, plan, . . 221 



153. ,, transverse section, showing Waste-pipe, . . 222 



154. ,, longitudinal section, .... 222 



155. ,, transverse section, showing Supply-pipe, . . 223 



156. Inlet-screen Box, longitudinal section, . . . 224 



157. plan, 224 



158. Transverse section of the Ponds, showing Scour-pipe, . 225 



159. Trap-box, showing Scour-pipe, 234 



160. Section of Guard and Valve, showing Scour-pipe, . . 235 



161. Bevel for dressing slopes, .... .236 



CRAIGEND PONDS. 



162. The Discharge-pipe, 238 



163. Section of ditto, .... 238 



164. Clay Valve-box in the Supply-pipe, longitudinal section, . . 240 



165. plan, . 240 



166. transverse section, . . 240 



167. Plan of the Ponds, showing the connection, . . . 241 



168. Well, ... 244 



169. Section of the Well, . . 244 



170. Transverse section of the Well, showing Catch-screen in position, . 245 



HOWIETOUN 300-FEEX PONDS. 



171. Outlet, plan, . 254 



172. section, . . 254 



173. elevation, . . 255 



174. Valve of Discharge-pipe, plan, . 255 



175. section, . 256 



176. transverse section, . 256 



177. Well, section, . . . .257 



178. plan, . .257 



179. ,, transverse section, ...... 258 



