ANTS IN CEDAR POLES 35 
nesota. This was a series of one tenth acre plots running from high 
land through a small swamp and up to the top of a ridge on the oppo- 
site side. Plot number one was located on dry land just at 
the edge of the swamp and showed an infestation of sixty per 
cent. Plot number two was partly in the swamp and showed 
an infestation of twenty-three per cent. Plot number three was 
all in the swamp and showed an infestation of twenty-three per 
cent. Plot number four was on the dry land sloping up from 
the swamp with an infestation of seventy-two per cent. The next three 
Fig. 7. Ant nest in cedar showing ants. 
plots, numbers six, seven and eight were high on the ridge and showed 
a sharp reduction in ant infestation to twenty-one, twenty-four and 
thirty-eight per cent respectively. This was the only locality where 
a sharp reduction of infestation on a ridge was observed. It was, 
however, by far the highest ridge on which cedar was studied and so 
no other plots were comparable to these. In addition to the high 
elevation, the cedar on this ridge was mixed with other species of trees, 
which may have had some influence on the extent of ant infestation. 
The high infestation on the strip of dry land bordering the swamp, 
which is shown so clearly in this series of plots, held true in every 
locality. These observations in the field correspond with the observa- 
