Periodical Literature 51 



frames, however, the dry seeds of the March harvest were un- 

 hurt by a temperature of 60° C. (140° F.) which, however, was 

 reduced to 55° or 56° (131° F.) as soon as the cones began to 

 open and released the seed. Green cones, on the other hand, 

 were injured at temperatures above 49° (120° F.), temperatures 

 so low that it became a question whether the use of artificial heat 

 in drying is at all profitable. 



Rather strangely, the seeds once separated from the cones can 

 endure for hours a temperature such that if exposed to it while 

 still held in the cones, they would suffer in viability greatly. 



Untersuchungen ilber den Einfluss verschieden hoher Darrhitze auf das 

 Keimprozent des Kiefernsames. Zeitschrift fiir Forst-und Jagdwesen- 

 May, 1905, pp. 296-312. 



The Swedish Forest Experiment Station 



Influences has investigated the influence of locality, 



on season, and age of trees on seeds and plant 



Seed Quality. product. The low summer temperature 



of 1902 and 1903 in North Sweden led to 

 the fear that the rich (/*. silvestris) pine seed harvest of 1903 

 might not have a good germination per cent. Results are re- 

 corded by G. Schotte. Size of cones depends on age of trees : it 

 required 6 per cent, more cones from 150 year stands than from 

 80 year trees to make the same measure. While 1000 seeds from 

 South Sweden weighed 4 to 5 g. , those from North Sweden only 

 2 to 3 g. With age, weight of seed declines. In 50 to 60 year 

 old stands, size of seeds is the same in both localities, but later 

 those of the northern region declines more rapidly in size. Seeds 

 from I^apland did not germinate, the per cent, as well as the 

 harvest, increasing gradually to normal in seeds from more and 

 more southern localities. Germination of South Swedish seed took 

 place in 15 days as against 55 days in more northern seeds, and 

 the length of needles and height of plants of the latter were only 

 half those of southern stock, which also had better roots. Seeds 

 of 40 to 60 year trees produced stouter plants than those of 100 

 to 150 year old, and also than those of 20 to 30 year old. 



Tallkoitens och tallfroets beskaffenhet skordearet, 190^-4. Skogsvards- 

 foreniugens Tidskrift, 1905, p. 165 flf. 



