51 



Germination in per cent after 5 10 20 30 days 



Alnus incana, Alpine seed 190203 57 61 64 64 



B B 190304 16 18 



33 46 



B 190405 59 76 78 



190809 63 66 68 



B 190910 22 29 32 



B B 191011 22 36 40 



B 191112 46 51 



B B Norwegian 189899 3 5 



' 190910 37 55 61 



B B B 191112 44 70 73 



The purity determinations with Alnus incana have provided 

 quite surprising results and shown that this seed is, to a very large 

 extent, adulterated with the always far cheaper seed of Alnus 

 glutinosa. 



For this reason I caused in 1903 04 a number of Alnus incana 

 samples that were sent to me, to be tested by the Seed Testing 

 Institution, with the following results: 



Pure seed Foreign seed Rubbish 

 (A. incana) (A. glutinosa) (Shales &c.) 



Norwegian Seed 87 / % 13 % 



Mid-European Seed 57 11 32 



B 47 IB 52 B 



B 12 25 63 B 



Alpine Seed 31 10 59 



B 20 10 B 70 B 



B B 25 B 4 B 71 B 



B B 27 B 19 B 54 B 



B B 25 B IB 74 B 



42 B 6 B 52 B 



B B 22 B 11 B 67 B 



B B 47 10 B 43 B 



B B 52 B 9 B 39 B 



French Seed 13 24 B 63 B 



Of the whole 14 only the Norwegian sample was quite without 

 admixture of foreign seeds. One Alpine sample was practically 

 speaking pure, while on the other hand the French and one Mid- 



4* 



