Vlll INTRODUCTION. 



running through populous countries will, in no long- 

 time, be wholly depopulated of their finny tribes ; and 

 how and why I will endeavour to show, not theoreti- 

 cally, but practically, after long experience in the 

 matter. 



In again taking up my pen to give such informa- 

 tion as I can on artificial spawning, breeding and 

 rearing of fish, I trust that the number of years in 

 which I have practised this art with perfect success 

 will warrant me in attempting to show how rivers and 

 streams may be restored to their former productive- 

 ness, upon simple, cheap, and unfailing principles, so 

 that there never need be a scanty supply of fresh- 

 water fish as an article of food. 



