LIST OF ILLUSTRATIONS xi 



TO FACE PAGE 



Three Poplars cut from a single Stump . .117 



Beavers' Road from the Water to a Grove of 



Poplars 122 



Beaver inspecting the Dam which has been broken 



IN Order that the Picture might be secured . 123 



A Dam made chiefly of large Logs, the Size of 



which is shown by Comparison with Man . 128 



The same Dam as that shown in previous Illus- 

 tration, Photographed from the Lower Side ; 

 THE Man, who is over 6 Feet tall, gives an 

 Idea of the Size of the Structure . . 129 



A Dam when kept in Repair retains the Water of 



the Pond almost to its extreme Crown . 140 



As A Dam falls into Decay the Site becomes over- 

 grown WITH Alders and Willows . . .141 



This Dam, no longer kept in Repair, will let the 

 Water escape, and before long will lose all 

 Semblance of its Original Form . . . 141 



A Beaver Pond seen from an Elevation. The 



Lodges are seen on the extreme Right . 144 



A COMPARATIVELY NEW BeAVER PoND FILLED WITH 



Trees which have been killed by the Water 144 

 When the Dam begins to Disintegrate the Pond 



RAPIDLY dwindles TO AN INSIGNIFICANT SiZE . 145 



Eventually Nothing of the Pond remains, and 

 THE Stream resumes its long-interrupted 

 Course ........ 148 



