FIGURE 4S.— Lummi Indian trainees examining trays of chinook 

 salmon fry on board the Brown Dd'ay. The trainees had 

 spawned adult chinook salmon and raised tlic fertilized eggs 

 to young fry. 



FIGURE 49.— A Lummi Indian trainee, working in the Broivn 

 Bear's water chemistry laboratory, measures dissolved oxygen 

 in the controlled water supply. 



DOWN TO THE FISHES' WORLD 



Man's concept of the aquatic world in which fish live 

 has been limited by his relative inability to penetrate that 

 world. Working from a boat on the ocean to understand 

 what occurs below the surface is similar to peering from 

 an airplane to observe human behavior on land that is hidden 

 by clouds. The Biological Laboratory now has the capability 

 to observe sea life closely over an extended period. 



A bathysphere capable of carrying two observers at at- 

 mospheric pressure to depths of 1,000 feet has been acquired 

 (fig. 50). The mist-green "bell" is constructed of special 

 steel plate more than i i-inch thick and has an inside di- 

 ameter of 514 feet. From their tight quarters, biologists 

 will have excellent visibility through 16 plexiglass portholes. 

 A hatch in the bottom of the chamber will permit divers to 



— 37 



