Primitive Angio sperms. 137 
understood to apply to the immediate ancestors only of our two groups 
of living Angiosperms. 
By the kindness of the authors, I am able to reproduce here the Table 
of Relationships given by Messrs. Arber and Parkin on p. 77 of their 
memoir : — • 
In referring to this skeleton pedigree, I do not mean to attach more 
importance to the views it represents than do the authors themselves. 
They clearly regard it as a provisional statement, which will probably 
require amendment in the light of future research. But the merit of such 
graphic statements is to suggest that historical perspective which it is so 
difficult to preserve in dealing with phylogenetic problems. 
In this Table the Primitive Angiosperms, defined as above, would 
stand in the main line of descent, just below the junction of Monocotyledons 
with Dicotyledons. We are entitled to assume that they possessed all those 
characters which are common to Monocotyledons and Dicotyledons. The 
L 
