Sounds  and  silence,  19,  20,  23,  26,  27,

i33»  '34-

Springs,  use  of,  204.
Spruce  Tree  Colony,  harvest  time  with,

83-98  ;  tunnels  in,  113-115.
Stream-flow,  effect  of  beaver  on,  72-

74,  213-217.
Strength,  9.
Subways.  See  Tunnels.
Swimming,  method  of,  6.
Tail,  uses  of,  5,  6,  n  ;  form  and  cover-
ing, 8;  signalling  with,  24,  31,  96;
fabulous  accounts  of  the  uses  of,

53-

Teeth,  7-9.
Three  Forks,  Montana,  42,  79 ;  canal
system  at,  107-111.
Trails,  in,  112.
Transportation  of  dam  and  food  ma-
terial, 86-90,  92,  93 ;  canals  used  in,
106-115;  tra''s  anc*  slides  used  in,
in,  112,  115  ;  tunnels  used  in,  112-
115.
Trappers,  164,  189-191.
Traps,  35,  189.
Trees,  cutting.  See  Cutting  trees.
Trimming  trees,  12,  96.
Trout,  205,  206.
Tunnels,  85, 112-115,  '98,  203,  206.
227


Water.  Ste  Stream-flow.
Water-ouzel,  199.
Water-supply,  85,  86.
Weather-wisdom,  44-47.
Weight,  7.
Wells,    food,  103,    104.    See  also  Ba-
sins.
Whistle,  26,  27.
Wildcat,  35.
Willow  Creek,  176.
Wind  River,  102,  175,  182,  188.
Winter,  beaver  life  in,  197-209.
Wolves,  gray,  191,  197.
Wood,  dead,  143,  144.
Work,  accomplished  by  beaver,  3-5.
Young,  birth  and  care  of,  27, 28  ;  growth
and  play  of,  28.
(Cbe  flitoetfibe  prcj*

CAMBRIDGE  .  MASSACHUSETTS
U   .   S    .   A


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