NOTJ'S ON THE BISHOP PINE 



893 



not to have injured the seed. In the following table the letter M is 

 used to indicate cones just mature, while the figures show the number 

 of years the cones have been held on the tree after maturity. It is to 

 be regretted that more cones of the older ages were not obtained, but 

 these are difficult to find inasmuch as some open during exceptionally 

 hot dry years and many are destroyed by rodents. 



Table l. — Seed Extraction Data. — Pinus Muricata Cones from Luffenholz Creek, 

 Humboldt County, California. 



°- Over 200° for short period when oven was out of control. 

 " Not recorded. 



The following figures show comparison of the above lot of cones 

 from old trees with a similar lot from young trees collected at Pacific 

 Grove, Monterey County; 



Humboldt cones.. 

 Monterey cones 



Average weight 



per cone green, 



grams 



29.3 

 39.2 



Number cones 

 per pound 



n.5 



11.6 



lyoss in drying 

 sufficient to 

 open, grams 



4:5 = 

 6.9 = 



Percentage ol 

 green weight 



It seems evident from the above that although cones from old trees 

 are much lighter in weight, it is necessary for them to give off a much 

 larger percentage of moisture before the cone scales will open. 



