X CONTENTS. 



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

 draw off the Water; n. 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 18-39 



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. Wire-Netting Hatching Trays. 

 Various Methods of using Trays : I. The One-Tier 

 Method; 2. The Double-Tier System; 3. Williamson's 



