[ 9i ] 
the periphery which is allocated to their corresponding major group. 
For Ferns I should advise a reference to Prof. Bower—for the 
Conifers there is at present very little consensus of opinion. The 
three families of Lycopodiales and one family each of Psilotales 
and Sphenopsida will offer no difficulty. It will be seen that if the 
sequence follows the periphery it will be only a formal list in which 
sometimes consecutive numbers are applied to nearly allied families 
and sometimes to families exceedingly remote from one another 
in affinity, as is the case when one passes from the Haplophylls to 
the Meiophylls, and thence to the Meriphylls. A reference must be 
made to the accompanying paper for definitions of these terms and 
for an explanation of the diagram. 
If these suggestions are of little service, at least they will show 
how remote botanical problems (even the morphological) are 
from solution. 
M. Benson. 
