202 TRANSACTIOXS OF ROYAL SCOTTISH ARBORICULTUKAL SOCIETY. 



They do not show how much. What is needed is a mathe- 

 matical expression for each species based on some definite 

 scale. Thus, for example, that the tolerance of hemlock is 89, 

 of yellow birch 61, of white oak 32, or whatever the actual 

 values might be proved to be. 



In the second part of the Bulletin the author describes and 

 criticises the various methods of determining tolerance by 

 empirical, anatomical or physiological and physical means, 

 and he ends up with a summary of the relative values of 

 the different methods. 



It is quite apparent that the light requirements of trees 

 growing in our insular climate, with its greater moisture and 

 more equable temperature, must differ from those of the same 

 species growing on the Continent or in America, hence it is very 

 desirable that investigations concerning the light requirements 

 of trees should be carried out under the climatic and other 

 conditions which prevail in this country. A. W. B. 



20. Development of Forestry in Scotland. 



Deputation to the Board of Agriculture.^ 



The Chairman of the Board of Agriculture for Scotland, who 

 was accompanied by Mr Sutherland, received the Council of 

 the Royal Scottish Arboricultural Society, on loth June, at 

 29 St Andrew Square, Edinburgh, to hear their views regarding 

 the development of forestry in Scotland. Mr R. Galloway, 

 S.S.C., secretary to the Society, accompanied the deputation. 



Sir Kenneth Mackenzie, Bart., in the unavoidable absence 

 through illness of Sir John Stirling-Maxwell, Bart., president of 

 the Society, introduced the Council, and referred to the corre- 

 spondence that had taken place between the Society and the 

 present Secretary for Scotland and his predecessor regarding 

 the appointment of a Department of Forestry under the Board. 

 Mr Munro Ferguson, M.P., gave a short history of the work 

 of the Society, and urged the immediate need of taking 

 steps to carry out the recommendations of the report of the 



[' A full report of this Deputation will be given in our next issue. — HON. Ec] 



