208 



INDEX 



Waters, land, as place of chordate 

 origin, 119 



oceanic, gathering of, 37 



vadose, 75 



Waucobian period, 76 

 Weathering, 32, 33, 80 

 Whales, 81 

 Williams, H. S., 69 

 Wilson, E. B., 94 



Winds, 54 



Winnemucka Lake, 185 

 Worms, 89, 90, 113, 114 

 Writing, invention of, 181 



Yemen, 188, 189 

 Young, C. A., 5 

 Yucatan, rainfall in, 188 



