lOO 



of larch, because larch probably continues to lead 

 throughout its whole life. If all the sylvicultural 

 peculiarities of both species are examined, which, 

 so far, cannot be kept separate and which explains 

 the confusion that has arisen in the biological 

 description of the Douglas fir, the rapid growth 

 of the Coast douglasia may be contrasted with 

 the greater safety and certainty of growth of the 

 Colorado douglasia. 



53. Sequoia gigantea. 



Less warmth and much more atmospherical 

 moisture is the first vital condition for this rapid- 

 growing, light-loving timber species, hence the 

 reason why it thrives better in an island climate 

 than on continents, better inside than outside the 

 forest, better on the hill than the plain. In such 

 situations the extreme temperatures of winter, 

 which form generally the greatest menace to its 

 existence, are not so intense, of which the 

 admirable results with the sequoia in Great 

 Britain, Switzerland, Wurttemberg, and the ex- 

 perimental gardens at Grafrath, 570 metres above 

 sea-level, gives ample proof. It is quite worthy 

 of further trials despite the failures, which may be 

 partly traced to planting it in places unsuited to 

 its development. 



