8 The Salmon 
the disease greatly, for the fish keep jumping at these falls con- 
tinually and cut themselves on the rocks, thus rendering them- 
December 1906. 
“Two Male 4o-lb. Salmon, unspawned, found together as shown, cast up on the beach. 
I16.- 
Fic. 

selves more subject to the disease. They cannot proceed farther, 
and the number of diseased fish soon increases, and each new 
fish on coming among them becomes affected too, so that the 
pools below the falls soon swarm with them. By April they begin 
