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 SlZE 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 ADAM FALLS INTO DECAY THE SlTE 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 SlZE . 145 



EVENTUALLY NOTHING OF THE POND REMAINS, AND 

 THE STREAM RESUMES ITS LONG-INTERRUPTED 

 COURSE . 148 



