Thompson’s Brook, 75, 85, 88, 146, 187 Thompson Pond, base of the Dome, Pownal (Vt.), 27, 145 Thoreau, Henry D., quoted, 10, 11, 15, 26, 84, 102, 125, 137, 157, 167, 183, 203, 231, 235, 237; admiration for the location of Williams College, 10, 11; on walking, 38; on Great Fringed Orchises, 105; descriptive of Notch Valley region, North Adams (Mass.), 216, 217, 219; ascent of Greylock, 216; entertained at Wilbur’s Farm, 216; possible origin of poem, _Rumors from an Æolian Harp_, 217; supper of rice, on Greylock’s summit, 219 Thorne-Apple, 174 Thrush, 12, 130; haunts of, 152; songs of, 153; nests of, 153; species of true, 153 Golden-crowned thrush, 153 Hermit-thrush, 153 Veery-thrush, 153 Water thrush, habits, 177 Wood-thrush, 153 _Thuja occidentalis_, 118 Ticonderoga, conflicts at, 97 Timothy-Heads, Cat’s-Tail Grass, 85 =Tipularia=, generic description, 280 =T. unifolia=, specific description, 281 _Transcript_, the, North Adams (Mass.), cited, 121 Trespassing, law against, 232 _Trillium_, 157, 162 _T. cernuum_, 163 Painted Trillium, 14, 19, 44, 134, 141, 163, 172, 175 Purple Trillium, 20, 21, 142 Troy-on-the-Hudson, 218; stages to, 198 Tulip mania, 136 Tulip-Tree, 234, 235 “Tunnel City” (North Adams, Mass.), 7 _Turdus_, 153. _See_ Thrush Turnovers, 117 Turtles, 129 =Twayblade, Lily-Leaved=, 162, 274. See _Leptorchis_, 274 =Large Twayblade=, 274 =Loesel’s Twayblade= or =Fen Orchis=, 275 =Twayblade, Lister’s.= See _Listera_, 267 =Auricled Twayblade.= See _L. auriculata_, 268 =Broad-Lipped Twayblade=, 268 =Heart-Leaved Twayblade=, 269 Twin Cascades, Hoosac Tunnel Mountain, 222 _Typha_, 25 U Umbrella-Fern, 199 Uncle Abe-the-Bunter, a local name for Abraham Parsons, 197 _Unifolium Canadense_, 20, 176 _Usnea_, 186 V _Vaccinium_, 119, 159 _V. corymbosum_, 118 _V. Pennsylvanicum_, 118 _V. vacillans_, 118 _Vagnera stellata_, 21 _V. trifolia_, 21 Valerian, American, 47 V. European, 47 V. False, 162 Van Courtlandt Farm, 166; Mansion, 163, 166, 202 Veery, 153. _See_ Thrush Venus-Hair Fern, 194, 195 Venus of classical literature, 58, 59 “=Venus Slippers=,” 34. _See_ Lady’s-Slipper _Veratrum viride_, 5, 47 _Verbascum Thapsus_, 238 Vermont, 10, 18, 40, 43 Virgil quoted, 119, 159 Virgin’s-Bower, 140 _Viola dens-canis_, 126. _See_ Dog’s-Tooth Lily _Viola_ or Violets, 5, 126, 130, 141, 165, 232; origin of name, 159 _V. bicolor_, 159 _V. blanda_, 5, 159. Sweet White Violet _V. Canadensis_, 159, 172, 208. Sweet Canada Violet _V. pedata_, 157-159. Bird’s-foot Violet _V. pubescens_, 157, 159. Downy Yellow Violet _V. rotundifolia_, 158. Round-Leaved Violet _Vitis cordifolia_, 181 W