STATISTICS OF METASPERMAE. 741 



From Table H the following statistics are compiled: 



The remainder of the Metaspermae of the Minnesota valley 

 may be classified as herbaceous, and of this element the sta- 

 tistics are as follows: 



Prom the above three tabulations it is seen that the herbace- 

 ous per cent, of the Monocotyledones is generally in excess of 

 the herbaceous per cents of the other two groups. And the 

 woody percentage of the Archichlamydeae is generally in ex- 

 cess of the woody percentages of the other two groups. In the 

 latitude of the Minnesota valley many of the original mono- 

 cotyledonous trees or shrubs have disappeared. All of the 

 trees are gone and all but two of the shrubs have failed up to 

 the present time to secure or regain a foothold. This we un- 

 derstand from the considerations indicated in the pre- 



