57 



WILLOW SALIX. As may be known, the seed loses its ger- 

 minating capacity very rapidly. Already in 1889* and 1900** I 

 directed attention to this. A germination test with SALIX CAPREA 

 was carried out in 1888. The seed was collected on 15th June, 

 placed for germination on the 16th and germinated 87 / in 2 days, 

 93 % in 6 days. 25 days later, the same sample only germinated 

 7 % in 10 days. 



But as I am continually being asked to supply Salix seed, a 

 new test was carried out in 1909. 



The seed was collected on June llth, and was placed for ger- 

 mination the next day, June 12th, and likewise on the 22nd, and 

 28th June and 5th July, and germinated as follows: 



Germination test 12. June: 2 days 67, 10 days 72 % 



22. 47, 6 48 



28. 45, 



5. July 5, 6 5 



Thus, as in 1888, after 24 days the seed may be said to be 

 worthless. If it is desired to sow Willow seed, it is best to collect 

 it oneself and sow it in a suitable, moist place, without covering 

 the extremely small seed with earth; it will then come up in a 

 few days. 



THE AMERICAN BROAD-LEAVED TREES. 



IN TABLE IV we find the same thing, particularly successful 

 germinating tests with only a few species little in demand. 



THE BETULA SPECIES mostly germinate quickly and easily, 

 as Table IV shows. Germination tests of the keeping qualities of 

 American birch seed are very instructive. A small lot of BETULA 

 NIGRA which I received from the Arnold Arboretum in summer 

 1911 and with which a series of tests were at once started, ger- 

 minated as follows: 



Germination in 5 10 20 days 



In September 1911 ... 62 80% 

 December ... 3 65 75% 

 May 1912 13 57 63% 



* Analyseresultater for 188889. 



** Lidt om Froanalysers Betydning for Skovfroett, Tidsskrift for Skovvsesen, Bind XII, 1900. 



