VI CONTENTS. 



very Secure ; 9. Shape of the Ponds ; 10. Be able to 

 draw off the Water; 11. Beware of Hiding-Places ; 

 12. Number of Ponds; 13. Protections for Ponds; 

 14. Spawning Beds. — Ainsworth's Spawning Races. 

 — Collins's Roller Spawning Box ; 15. Inlets and Out- 

 lets; 16 Screens iS-39 



CHAPTER III. 



BUILDINGS. 



Buildings required. — Meat Room. — Store-Room and Car- 

 penter's Shop. — Office. — Ice-House. — Other Struc- 

 tures. — Hatching House. — Size of Hatching House ; 

 Location ; Shape ; No Fire required ; Skylights ; Wa- 

 terproof Partitions 40-46 



CHAPTER IV. 



HATCHING APPARATUS. 



Enumeration of Hatching Apparatus : i. Supply Reser- 

 voir; 2. Hatching-Room Aqueduct, Effect of Air on 

 Temperature of Water ; 3. Filtering Arrangements : 

 Nature of Sediment, Filtering Tanks and Screens, 

 Flannel for Filters, Cleaning the Filters ; 4. The Dis- 

 tributing Spout, Temporary Aqueduct, Gravel Filter ; 

 5. Hatching Compartments or Hatching Apparatus 

 proper. Responsibility of. — Materials. — Glass Grilles 

 vs. Charcoal Troughs. — Expense of Carbonized Wood 

 compared with Glass Grilles. — Discovery of Carbonized 

 Wood for Hatching. — Wood lined with Glass inade- 

 quate. — Placing the Hatching Troughs ; Dimensions ; 

 Compartments ; Elevation ; Inclination. — Screens. — 

 Trap-Box. — Laying the Gravel ; Size of Gravel ; Prep- 

 aration of; Depth. — The Covers. — Most Embryos 

 develop in the Dark. — Covers a Protection from Ene- 

 mies. — Glass Grilles 47-6/ 



