24 



Germination in per cent after 5 10 20 30 100 days 



Pinus canariensis 191011.. 47 86 88 (+ 1) 



excelsa 190809 17 93 



Gerardiana 1908 09.. 14 48 56 (+17) 

 (same lot) 



191011 4 38 (+16) 



halepensis 190708. . . 5 66 89 (+ 2) 

 leucodermis, undoub- 

 tedly old seed, 1908 09 17 12 27 (+62) 

 leucodermis (same lot) 



190910 13 (+ 5) 



longifolia 1908 09.... 1 88 91 



maritima 1910 11.... 14 80 88 (+ 4) 



Pinus Cembra from the Tyrol and Pinus Cembra from Sibe- 

 ria, P. Siberica, as H. Mayr calls it, both germinate so slowly 

 that the seed must be prepared stratified in the nurseries for a 

 year before being sown. For this reason also it cannot be brought 

 to germination in reasonable time by artificial means. Quite excep- 

 tionally, it has been possible to obtain the following result from 

 Tyrolese seed: 10 days 10% 40 days 15 (+75)/ . 



MOUNTAIN PINE - - PINUS MONTANA. The extensive em- 

 ployment of the Mountain Pine in Danmark as a nurse for the 

 spruce in plantations on the heaths of Jutland, has naturally brought 

 with it a large number of tests of this seed; 86 samples in all, if 

 the three forms the single-stemmed, the ordinary many-stem- 

 med Mid-European and the creeping forms are taken together. 



If the seed is good, germination goes smoothly from the start. 

 The highest germinating energy (1902 03) and the lowest germi- 

 nating capacity are shown by the following figures, for seed of 

 the common Mountain pine, of Danish origin: 



Germination in per cent after 

 Seed weight 5 10 20 days 



190102 7.6 38 93 98 



190203 7.43 87 96 97 



188889 5.52 19 32 



The highest seed weight was 8.17, the lowest 5.52 and the mean 

 6.87 grams. 



The seed of the French, single-stemmed Mountain Pine Pinus 



