52 THE TARPON 



Miss Luella E. Cable, Junior Aquatic Biologist of the Fed- 

 eral Bureau of Fisheries, has kindly prepared a drawing of 

 the air bladder. Another cross section drawing shows the 

 blood vessels running through the lung tissues. 



I again express my grateful acknowledgments to Dr. Hilde- 

 brand. His patient labor and technical skill have made this 

 research possible. 



