254 BT HOOK AND BY CBOOK. 



flood simply sweeps away the diseased fish, but within 

 a few days the malady reappears. 



When the health of human beings or animals is 

 ascertained to be injured by overcrowding or defective 

 sanitary arrangements, not only are endeavours made 

 to cure the sufferers, but precautions are taten to pre- 

 vent the repetition of the initial causes of the evil, by 

 the correction of defects. 



It is impossible to gauge the extent to which the 

 present stock of trout may be affected in the near 

 future, and it must be apparent that their non-migratory 

 habits deprive them of the same natural means of 

 recovery as is possessed by salmon ; so, in all probability, 

 each fish attacked — dies. 



