20 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



on which the incidence of the deleterious vapours must always 

 depend, are taken into account. Primarily the fumes start 

 upwards. They may or may not be earlier or later brought 

 to the ground, according to lateral winds and other conditions, 

 and in certain conditions portions comparatively near the 

 bing may be less affected than portions farther away." 



With the judgment of the Lord Chancellor the other Lords 

 who also heard the appeal (Lords O'Hagan, Blackburn, and 

 Watson) concurred, and, as already stated, the interdict was 

 confirmed. 



As will be seen from the above necessarily brief summary, 

 the case abounds in questions of the greatest interest, not only 

 to the forester but to the chemist; it is remarkable for the 

 elaborate nature of the investigations carried out in connection 

 with it, and also illustrates, incidentally, the great difficulty 

 which sometimes arises in legally proving the source of an 

 injury, although, to the ordinary observer, there may not be 

 any doubt whatever as to the cause. 



4. Demonstration Forests for Scotland. 



By F. L. C. Cowley-Brown, Indian Forest Service. 



The continued existence of a tendency to minimise the 

 importance of Demonstration Forests in connection with forest 

 education in Scotland, can only be due to a lack of acquaintance 

 with the first principles of scientific forest training. 



The forester of the old school may almost be said to have 

 habitually confounded silviculture (the science of growing 

 forests) with arboriculture (the art of growing individual trees). 

 The two are entirely different, both as regards the result aimed 

 at and the method to be adopted, and any attempt at com- 

 promise must end in disappointment and failure. Isolated trees, 

 or small groups of trees, are grown primarily for purposes of 

 ornamentation in parks, gardens, avenues, etc., — the financial 

 return or timber-yield being at best of very secondary import- 

 ance. In the management of forests proper, on the other hand, 

 the main object is the regular annual or periodical yield of 

 produce, and a similarly regular financial return. In the 

 scientific management of a forest, aesthetic considerations should 



