66 ROYAL SOCIETY OF CANADA 



affinities. In order to ascertain how far these results accord with 

 those derived from general morphological data, the sequence may- 

 be compared with that given by Eichler. The principles employed in 

 'determining the sequence of genera, are as follows: — 



1st. The eight characters which may be regarded as fixed and of primary im- 

 portance, are assigned values in the order of their supposed develop- 

 ment. They are indicated by x. 



"2nd. Characters which have become eliminated in the process of development, 

 are assumed to have the same value as those which survive, and they 

 are indicated by — 



3rd, All sporadic characters are indicated by (1) but are assigned no value. 



-4th. The distribution of resin cells, being associated with an advanced develop- 

 ment, are given the highest position in the series, but being of subor- 

 dinate value as a character, only half values are assigned. 



