10 



these species do not occur indigenously, are of Northern or 

 Mid-European origin as is mentioned later , he feels that we 

 are only now so far advanced as to be able to proceed regularly 

 and systematically, so that by the end of the next ten years we 

 shall have made some real progress in the knowledge of the test- 

 ing of forest seeds. If the small work that is here published 

 is only recognised as a good beginning, the wishes and hopes of 

 the Author will be amply fulfilled. 



For the trouble taken in working out the tables which accom- 

 pany this publication, the Author has to thank Miss Ingeborg Ja- 

 cobsen, Assistant in the Danish State Seed-testing Establishment 

 and daughter of the deceased Chr. P. Jacobsen mentioned above. 



The Author also desires to express his indebtedness to Professor 

 Fraser Story and Mr. Thomas Thomson of the University College 

 of North Wales, Bangor, who kindly undertook the translation of 

 the work into English. 



Kbbenhavn (Copenhagen), 1915. 



