: 



Stereo Copyright, die. 



Lone/on and .\~eiv Y 



CLEOPATRA TERRACE, WITH ITS MIRROR-LIKE POOLS, 

 YELLOWSTONE PARK, U.S.A. 



These beautiful basins are formed of incrustations of volcanic limestone. They are 

 of all colours: pink, orange-yellow, green, and blue. The water in them is of a 

 brilliant blue, caused by the growth of water plants (algae), which live in water with 

 as high a temperature as 150" F. 



