IOWA ACADEMY OF SCIENCE 
263 
boards and putting on a new roof. Near by cultivators and wagons 
were dug out with much labor. A lister in the field back was dug 
out twice in three days, showing a fill of about 4 feet in that time. 
Mr. Seth Dean, county surveyor of Mills county, a civil engineer 
of long experience in that region, from whom most of the altitudes 
for this paper have been obtained, says that in a single storm the 
Wabonsie has covered 100 acres one foot to a foot and a half, and 
argues that supposing the Missouri had occupied the north and 
south lakes at the same time and retired 100 years ago there has 
been time for the Wabonsie to have separated the lakes and built 
