^7 



at an early age. This peculiarity has been the 

 source of quite a mass of literature, ^ and has 

 been far too greatly exaggerated as regards its 

 sylvicultural value. It would seem that the 

 reproductive power diminishes rapidly part passu 

 with the lessening of warmth during the growing 

 season. A favourable subject for this particular 

 kind of investigation was found in the experi- 

 mental forest gardens of Professor Mayr, at 

 Grafrath, near Munich. In those gardens there 

 were numerous instances of Pinus rigida being 

 partly broken and partly bent by snow, so that 

 it was deemed better to cut all flush with the 

 ground, and the investigations carried out three 

 years afterwards proved that only 3 '8 per cent, of 

 the trees produced shoots from the stem stumps, 

 and one half of these had at the time of investi- 

 gation a great number of shoots already dying, 

 so that, speaking of the whole number of trees 

 for the three years, barely 2 per cent, of them 

 yielded shoots possessing any vitality. N|0 

 doubt the cold situation, 570 metres above sea- 

 level, on a forest area in which the rigida had 

 been used as a nurse, was something to blame 

 for the unfavourable result with these pines. 



' Sprengel, " Widerstandsfahigkeit der Pinus rigida gegen 

 Feuer," "A. F. u. J.," 1896, p. 175. Ditmar, " Ausschlagsfahig- 

 keit der P. rigida," 1889, p. 75, "A. F. u. J.," Dr. Laspeyres, 

 " Ausschlagsfahigkeit der P. rigida," 1889, p. 65, "Z. f. F. u. Jw." 



