234 Forestry Quarterly. 



seed results in seven-ninths as many plants as seed with a germi- 

 nation of 90% ; but actually results in only about one half the 

 number — it therefore is not worth seven-ninths as much but only 

 one-half as much. According to exhaustive experiments by 

 Oberforster Haack the plant per cent. (Pflanzenprozent) always 

 lags behind the germination per cent. (Keimprozent). The 

 real worth of a seed is determined by the plant per cent. — t. e. 

 the actual number of plants resulting, under normal conditions, 

 from a hundred average seeds. 



Assuming 85% as the normal germination, the factors to be 

 used in determining the amount of seed actually to be sown for 

 the different germinations per cents, is as follows : 



If therefore, the directions call for sowing 5 lbs. of 85% 

 (normal) seed per acre, 11 lbs. should be used if the seed has 65% 

 germination, 7 lbs. if 75% and only 3^ lbs. if the germination is 



95%. 



Prussia is now producing all the seed which its government 

 forests need. It does not sell its seeds since this would interfere 

 with the private seed industry. The various Darren are placed 

 centrally and to them are sent the cones collected on the various 

 forests. It is a rational, economical procedure based on natural 

 laws which we in America would do well to bear in mind, as we 

 approach the problem of supplying the seed for our increasmg 

 operations in artificial regeneration. 



