14 SCIENCE SKETCHES. 
to look, and whether caddis-worms and young 
mosquitoes were really as sweet and tender as he 
used to think they were. Then he thought some 
other things; but as the salmon’s mind is located 
in the optic lobes of his brain, and ours is ina dif- 
ferent place, we cannot be quite certain what his 
thoughts really were. 
What our salmon did, we know. He did what 
every grown salmon in the ocean does when he 
feels the glacier-water once more upon his gills. 
He became a changed being. He spurned the 
blandishment of soft-shelled crabs. The pleasures 
of the table and of the chase, heretofore his only 
delights, lost their charms for him. He turned 
his course straight toward the direction whence 
the cold water came, and for the rest of his life 
never tasted a mouthful of food. He moved on 
toward the river-mouth, at first playfully, as though 
he were not really certain whether he meant any- 
thing after all. Afterward, when he struck the full 
current of the Columbia, he plunged straightfor- 
ward with an unflinching determination that had 
in it something of the heroic. When he had passed 
the rough water at the bar, he was not alone. His 
old neighbors of the Cowlitz, and many more from 
the Clackamas and the Spokan and Des Chites 
and Kootanie,—a great army of salmon, — were 
with him. In front were thousands pressing on, 
and behind them were thousands more, all moved 
by a common impulse which urged them up the 
Columbia. 
They were all swimming bravely along where the 
current was deepest, when suddenly the foremost 
