vi 
CONTENTS. 
CHAPTER WV. 
Fishing Weirs—Fishing-Mill-Dams—Ordinary Dams—Newly 
Erected Weirs—Salmon Ladders or Passes—The Balliso- 
dare Ladders—A Fishery created by Salmon Ladders— 
Other forms of Salmon Passes—Salmon Passes versus Mills 
CHAPT ERI Vi. 
Pollutions—Extent of Salmon Rivers destroyed by them— 
Different Sources of Pollution—Means of remedying the Evil 
—Serious effects of Pollution on Health and Trade— 
The Sewage Question and the Thames—The Abolition of 
Pollutions—Suggested Scheme . : : . . 
CHAPTER NAL. 
Artificial Breeding of Salmon—Its Advantages—Extensively 
adopted in America and Canada—lIs it Essential >—Upper 
Proprietors and Salmon Angling—Scientific Aspects of 
Artificial Propagation—Non-Migratory Sa/monide—Classifi- 
cation of Salmon—Bull Trout versus Salmon—Study of 
Natural History—The Pacific Salmon Problem—Kippered 
Salmon—Natural Phenomena affecting the Fisheries—Legis- 
lation—Introduction of Salmon into Australasia—A glance 
into Futurity—Conclusion ‘ - : . 
PAGE 
45 
58 
€6 
