LOCAL CONDITIONS AND HEALTH OF GROUSE 315 



of stock regulation and moor management have come to 

 be more generally recognised and practised, the conditions 

 which gave rise to the disastrous outbreaks of " disease " 

 in 1867 and 1873 no longer exist to the same extent as 

 before. 



The deduction to be drawn from the study of the series of 

 maps is that there is no Grouse-producing district which can 

 claim to be entirely immune from attack. Occasionally an 

 individual moor may show a clear record for a long period ; but 

 even this is probably due to strict control of stock and freedom 

 from immigration rather than because that particular piece of 

 ground possesses characteristics which protect the Grouse from 

 disease. The only true test of freedom from disease is the 



1902 



1903 



dissection of the birds themselves. If it can be shown by 

 dissection that the birds from any particular moor are at all 

 times free from the Strongyle worm it may fairly be claimed 

 that that moor is disease-free. But up to now only one moor 



