Campbell ’ — The Embryo-Sac of Peperomia. 117 
who apparently regards the simple flower of the Piperaceae 
as reduced from the type found in the Saururaceae. 
The question as to the relative antiquity of Monocotyledons 
and Dicotyledons is one which has not yet been answered, 
as the geological record is by no means complete. The close 
resemblances, however, between the Piperaceae and the lower 
series of Monocotyledons suggests that the divergence of the 
two divisions of the Angiosperms ’may have occurred very 
early ; but much more evidence is necessary before it will be 
possible to decide this important question. 
Stanford University, California, 
Jan ., 1901. 
