Artificial Propagation. 299 



But besides -these protective measures, means 

 must be taken by the artificial hatching of ova on 

 an extensive scale to restock those streams which 

 this virulent pestilence has impoverished ; and in 

 work of this description our new Fishery Boards 

 and our newer National Piscicultural Association 

 will find abundance to do. All will acknowledge 

 with gratitude the labours of Sir James E. Gibson- 

 Maitland and other workers in this field, and will 

 look for great results from the latest experiment of 

 Mr Napier, of the Forth Fisheries, by which he 

 has established the fact that it is both possible and 

 easy to incubate the ova not only of diseased but 

 even of recently dead fish. When we are told by 

 the Inspectors of Fisheries for England (in their 

 Eeport for 1882) that from 2000 to 4000 diseased 

 salmon are annually removed from the Tweed 

 alone, 1 even if we reckon only one-third of them 

 unspawned, we must find it difficult to overrate the 

 importance of Mr Napier's discovery. 2 But to reap 



upwards of 500 miles of rivers and lochs in Scotland wholly or 

 partially closed against salmon by natural obstruction ; the Falls 

 of Tummel alone obstructing upwards of 100 miles of water." 



1 During the years 1880, 1881, and 1882, no fewer than 22,756 

 diseased salmon, grilse, and sea-trout were taken out of this river. 

 See Mr Young's First Report to the Fishery Board for Scotland, 

 page 43. 



2 Nearly a dozen fish-hatcheries have now been constructed in 

 Scotland. In Linlithgow Loch Hatchery, as reported in Septem- 



