414 BROOKLYN BOTANIC GARDEN MEMOIRS 
change in the flora. There would be then two phases in the life of 
our bogs. 
rst. The marl ponds in which lime-loving plants predominated 
and especially Chara and which are filled with and often surrounded 
by beds of marl or “bog lime.”’ 
2nd. Peat bogs which from the bottom up are composed of non- 
alkine peat which in all their history have been inhabited by oxylo- 
phytes. 
Between these two phases gradations of all degrees occur in the 
peat bogs of western New York. The succession might, of course, 
be in the other direction if the calciferous phase should become pre- 
dominant over a previous carboniferous one. But such a case is 
unknown in western New York. 
