mishandle their exotics or leave them to the 

 mercy of the animals of the forest. 



German foresters have tried, not only by ex- 

 perimenting under the most different conditions, 

 but also by studying and travelling in the home 

 of the exotics, to find a natural scientific basis 

 as quickly as possible, and thus make the plant- 

 ing trials a success and save time, money, and 

 material. 



In this respect the travels of Prof. D. Heinrich 

 Mayr to America and Asia were decisive. The 

 results of these travels appeared in the " Wal- 

 dungen von Nord Amerika," 1890 (" Forests of 

 North America," 1890). 



These studies in America, as well as the results 

 of European plantation experiments during the 

 last twenty years, have brought so many scien- 

 tific facts to light concerning a large number 

 of American species that even American foresters 

 may now improve their knowledge of the sylvi- 

 cultural peculiarities of their own trees through 

 these studies. 



The object of the following little work is 

 to show what timber from America is put on 

 the German market, and, further, to show with 

 what success the economic and sylvicultural 

 question of the introduction of American trees 

 is being solved, particularly in Germany. 



My warmest thanks are due to Mr. Wilson, 



