84 



empty cones remain to a great extent on the 

 tree and close up again in damp weather, this is 

 the reason of the quite unnatural representation 

 that the cones of the Pinus banksiana only first 

 open when fire spreads through the forests 

 (" Rod and Gun in Canada," Forestal Section, 

 1902, page 17, relating to Pinus banksiana). 



10 of the largest cones weighed, fresh, 94-80 

 grammes. 



10 of the smallest cones weighed, fresh, 3 5 '2 2 

 grammes. 



Consequently one medium cone weighed 6 "5 

 grammes. 



The specific gravity of the largest cones, 

 fresh, was 106*5 grammes. 



The specific gravity of the smallest cones, 

 fresh, was igo'i grammes. 



Average, 107 "8 grammes. 



If water equal to 100 grammes. 



In length the largest cone was 6 centimetres, 

 the medium size 4 centimetres, and the smallest 

 2 centimetres. i litre of the largest cones 

 yielded 809 grains, weighing, after cleaning, 

 2 "45 grammes, i litre of the smallest cones 

 yielded 600 grains, which weighed i"oi grammes. 

 Consequently for i kilogramme of seed an 

 average of 71,320 cones is required, which 

 occupy a space of 735*26 litres, i kilogramme 

 of seed contains between 300,000 and 500,000 



