XIV 



Illustrations 



The Pot-Hole of Wash-Tub Brook, Pownal, Vermont, 



Showing the Stream Whirling through its Basin . 190 



An Ancient Pot-Hole, Showing an Erstwhile Revolving 

 Stone, Located on the Granite Ridge, near the Wolf's 

 Den, Bronx Park, New York City * .... 194 



The Bluebells of New England {Campanula rotundi/olia) * 196 



Three Rare Ferns from Gregor Rocks and Wash-Tub 

 Brook Region, Pownal, Vermont: i. Rue-in-the-Wall 

 Spleen wort {Aspleniuni Ruta-muraria) ; 2. Purple- 

 Stemmed Cliff-Brake {Pellcea atropiirpured) ; 3. Walk- 

 ing Fern (Gz?«/:>^o^^rw5 r^z>C!/!'^jj///w5) * . . . 198 



The Rocking Boulder, Located on the Granite Ridge near 

 the Bear's Den, in the Zoological Garden, Bronx 



Park, New York City 200 



A pressure of fifty pounds causes this boulder 



to move about two inches. 

 From photograph by George Stonebridge. 



The Red Wood Lily {Lilium Philadelphicum) . . .210 



The Cascade of Notch Brook, at the Base of Mount Grey- 

 lock's Brotherhood, North Adams, Massachusetts . 212 



Notch Valley and the Bellows-Pipe, North Adams, Massa- 

 chusetts. Mount Grey lock towers up on the right, 

 and the Ragged Mountains on the left hand . . 218 



The Marble Arch of the Natural Bridge, North Adams, 



Massachusetts 228 



The Star-Blossoms of the Grass of Parnassus {Pamassia 



Caroliniana), and the Ladies* Tresses . . . 234 



The Hoosac River, Pownal, Vermont* .... 238 



The Fragrant White Moccasin-Flower {Cypripedium Mon- 



tanum) 242 



Colored 



The Showy Moccasin-Flower {Cypripedium regince)* . 244 

 This is the most gorgeous Cypripedium in 

 the world, and without doubt one of the 

 most ancient types of the genus. 

 Colored 



