364 BOTANICAL GAZETTE [NOVEMBER 
ventures prove successful, we may hope for an interesting body of 
scientific information to come from the study of bog sections. The 
work of ANDERSON, LAGERHEIM, SERNANDER, WEBER, and others 
in Sweden and Germany, gives indication of the data concerning 
postglacial migrations of plants and animals, and climatic~changes, 
which will be obtainable when our bog deposits become of economic 
importance. 
ot - ry ahold - 
of a a Ye er 2 / 2 ‘og sais 
~— 
TIS 3 Oe ag oy ‘, 4G 
he va “iba oe ar eM, 
Ores ea see 
. 
wy 
gti) 77, 
ks ee ae 
in Reon os 
Fic —Diagrams, gitar three stages in the developme 
deposits i in hee basins. In drawing the figures it has been assume’ 
marl and peat deposition are 5 eabS equal. The peat —_ 
on the western side is the basin. On the east side a common 
st Jacial times 
: sete 
diene Oe 
to the northeastern conifer forest formation have reached oar Modal the south- 
igan. 
eastern broad-leaved forest formation, 
mineral soils, while the conifers are almost restricted to bog areas- 
