83 



The largest cones weighed, air dried, 407-10 



grammes. 



The smallest cones weighed, air dried, 44172 



grammes. 



Showing an average of 424-41 grammes. 



When the cones were opened their bulk 

 increased from i litre to 2\ litres. 



i litre of the largest open cones weighed 

 127-60 grammes. 



i litre of the smallest open cones weighed 

 I2 3'55 grammes. 



Average, 125-57 grammes. 



The number of the largest closed cones was 

 55 per litre, and 140 of the smallest ; of the 

 largest opened cones 17, and the smallest open 

 ones 38, thus averaging 97 for the closed and 

 27 for the open. As regards the largest cones 

 all, barring two, opened at an average tempera- 

 ture of over 25 degrees Celsius, and of the 

 smallest 35 remained shut. As this temperature 

 is very common in the open air, and even with 

 great care the cones can be heated to as much 

 as 45 degrees, it may be assumed that ordinary 

 atmospherical conditions will suffice to bring all 

 the banksiana cones to their opening point to at 

 any rate within 5 per cent., as happens in the 

 case of the Grafrath trees, partly first of all in 

 October, and partly in March and April. As the 



