STATISTICS OF METASPERMAE. 



747 



In the aquatic element the preponderance of Monocotyledones 

 is to be noted. This taxonomic group is also apparent as form- 

 ing the greater percentage of the marsh and swamp element. 

 On the other hand the Metachlamydeae are preponderant in 

 the drier- soil element, although their percentage is practically 

 equivalent to that of the Archichlamydeae. These statements 

 are based upon the third column of figures, and thus correction 

 is made for the actual numerical differences of the three taxo- 

 nomic groups. In this way a more exact notion is given than 

 if such correction was not made, and in general, it may be said 

 that the analysis must always take into account the varying 

 actual numbers of one group or another. In the marsh and 

 swamp element we find an interesting confirmation, so far as 

 these figures are of value in evidence, of the views stated on 

 pp. 602-603 above, where the Cretaceous physiognomy is briefly 



