io6 



quainted with the results of all these experiments 

 that others can take place, which in some par- 

 ticular respects (say, different soil, climate, or 

 method of raising) the experiment is different, 

 so that in the case of some failure the exact 

 cause of it can be given there and then. The 

 mere accumulation of unfavourable conditions in 

 one experiment, such as bad soil, cold situation, 

 open location, depredations of forest animals, or 

 the rivalry of weeds and copse wood does not 

 yield in the case of failures any useful starting 

 point for further experiments. 



5. The farther any variety of tree, be it indi- 

 genous or foreign, is transplanted away from its 

 native home to a colder climate the better the 

 soil and the more abundant the light that must 

 be given to it. 



6. The farther some variety of tree is trans- 

 ferred away from its climatic home to a warmer 

 region the greater claims has it on moister soils. 

 It will stand longer and stronger effects of light, 

 which, again, facilitates its being raised under 

 slight shade. 



7. On poorer soils all kinds of trees are in 

 greater need of light, so that their raising under 

 shade becomes more difficult. 



8. As a protective growth, broad-leaved, light- 

 loving trees should be used wherever possible, 

 such as birches, poplars, willows, alders, and 



