34 



weight from 68 samples of Danish seed is 2.65 and 3.81 respectively; 

 mean weight 3.19 grams. A Canadian sample weighed 2.45 and a 

 sample from the Black Hills in South-Dakota: 2 grams. 



Apparently our Danish White Spruce is a descendant of the 

 earliest coast forests of which the settlers of the Eastern United 

 States took possession, while the Black Hills seed came from the 

 eastern slopes of the Rocky Mountains in the State of South-Dakota. 

 This is quite sufficient to make a great difference in seed weight, 

 while, in addition, seeds from vigorous artificial woods may often 

 be larger than those from natural forests. The best and worst germ- 

 ination results for the whole period were as follows: 



Germination in per cent after 10 20 30 days 



Danish seed 190910 81 93 



188788 9 11 



American seed 39 58 (+7) 



Canadian seed 76 



PICEA RUBENS very similar to Picea alba has a seed 

 weight of 3.6 grams and germinated 6 / , 27 % and 32 % in 10, 

 20 and 30 days respectively. 



PICEA NIGRA belongs to the same group. The mean seed weight 

 is 3.33 gr. The best germination result was obtained in the season 

 190203 with 71 % and 86 % in 10 and 20 days. The lowest germ- 

 ination result was in 1893 94, 46 % in 30 days. 



The two Rocky Mountain Spruces have always yielded good 

 seed which germinates quickly and easily: 



Germination in per cent after 10 20 days 



PICEA ENGELMANNII, highest 190001 ... 94 96 



lowest, 191112 56 64 



PUNGENS, highest, 190102 97 98 



lowest, 190607 69 71 



The highest germinating energy in the case of Picea Engelmannii 

 was found in the year 1903 04, when 79 / germinated in 5 days, 

 and in the case of P. pungens, likewise in 1903 04, with 68 % 

 in 5 days. 



SITKA SPRUCE - - PICEA SITKAfiNSIS. In contradistinction to 

 the two spruces from the Rocky Mountains, it is rather difficult 

 to obtain a good germination result with the seed of the Sitka 



