XIV CONTENTS. 



PAGE 



Plank filter Slate filter Wood filter. " Theory of waste " Slate 

 trays and hatching-boxes Exudance of gas by ova Sediment 

 Safety-screen Protection of the ova from: 1, mice; 2, light; 3, 

 fungus Charring the boxes Description of the original Howietoun 

 hatching-box Glass grilles Manner of introducing the water into 

 the hatching-boxes Inlet screens Breakwater The E-spout The 

 rearing-boxes Drains, . . . . . .103 



CHAPTER X. 



SEASON 1874-75. 



Construction : Craigend Dam. Intake works Leaf-screen Sluice Safety- 

 screen Distributing spout A summer spate. Craigend Hatching- 

 room. Slate cistern Slate and glass grille Eearing trough, . 135 



CHAPTER XI. 



SEASON 1874-75. 



Construction : Howietoun. Description of Howietoun Location of ponds 

 Site selected. Intake works: Plank ponds. Method of introducing 

 the water Gravel : Disadvantages of. Small larder at Craigend. 

 Removal of fish into the plank ponds, . . . .150 



CHAPTER XII. 



SEASON 1874-75. 



Experimental Work. (1.) Loch Leven eggs milted by a burn-trout male; 

 milt bottled six hours before using. (2.) Loch Leven eggs milted by a 

 burn-trout male; same as No. 1, but males transported alive. (3.) 

 Loch Leven eggs milted by a burn-trout male; the male immature, and 

 quantity of milt small. (4.) Burn-trout eggs milted by a Loch Leven 

 male ; milt bottled twenty hours before using. (5.) Loch Leven eggs 

 milted by a burn-trout male ; eggs bottled twenty hours before using. 

 (0.) Loch Leven eggs milted by a Loch Leven male pure; eggs with red 

 liquid. (7.) Sea-trout eggs milted by a burn-trout male ; male very 

 small. (8.) Loch Leven eggs milted by a sea-trout male. (9.) Sea- 

 trout eggs milted by a Loch Leven male. (10.) Burn-trout eggs 

 milted by a burn-trout male; ova cut out of a dead female. (11.) 

 Burn-trout eggs milted by a sea-trout male, . . .162 



