418 THE KEEPERS BOOK 



be engineered to form one. In the pool so found, or 

 formed, a small covered chamber should be constructed, 

 guarded at the intake by an iron grating to exclude 

 flotsam. From within this chamber the main water 

 pipe, further protected by a rose, will be led to the 

 hatchery. If the water can first be filtered through an 

 outer chamber of gravel, additional security will be given 

 against danger from the deposited sediment of " spate " 

 water. The pipe will terminate within the hatchery 

 itself, which we are now in a position to describe. 



The hatchery, then, is a simple wooden structure, 

 20 ft. long by 17 ft. broad, standing on a sloping 

 gravel foundation. The back wall is 7 ft. and the 

 front wall n ft. 4 in. in height, giving the lean-to 

 roof, which is covered with patent roofing felt, sufficient 

 slope from front to rear to throw off the rainfall. The 

 whole structure is thoroughly tarred over. As direct 

 sunlight, or indeed a strong light, is detrimental to the 

 ova, the house faces away from the south, and in this 

 front wall alone are the door and three small fixed 

 windows, one being over the door and one on each 

 side. These windows are obscured by green cloth roller 

 blinds. 



The walls, of ordinary white pine, are built double, 

 and the spaces between the standards are filled in with 

 sawdust to preserve an even temperature. 



The floor space, sloping towards the front door, is 

 occupied by eleven hatching boxes, which, as the plan 

 shows, are arranged to allow of convenient working. 



