LIST OF PLATES 
Secretary's. -Report; Plates. 4, -2+--2+2242> 2s). 
The scientific importance of X-rays (Garland): Plates 1, 2-----_________ 
Visible patterns of sound (Potter): Plates 1—4----_---_____ 24 
Fluorine in United States water supplies (Van Burkalow) : Plate 1______ 
The birth of Paricutin (Gonzalez and Foshag): Plates 1-10___________ 
The natural history of whalebone whales (Mackintosh): Plates 1, 2____ 
Life history of the quetzal (Skutch) : Plates 1-4______________________ 
The sun and the harvest of the sea (Schmitt) : Plates 1-10______________ 
Archeology of the Philippine Islands (Janse): Plates 1-15____________ 
Palestinian pottery in Bible times (Kelso and Thorley) : Plates 1-3______ 
IV 
