134 
Psyche 
[December 
near the York Road in the middle region, called the flats, and 
the larger one in the south, village, region. 
The area embraced by the population in 1920 is no more 
extensive than in 1905 and the number of active mounds about 
the same, but there was a shift of relative location of many 
domiciles: the north losing, the middle and especially the south 
village gaining many new mounds. 
There had been increase in density of housing: in the north 
and middle concentration had resulted from occupancy of about 
one fourth the former area. Concentration is accompanied by 
abandonment of some areas and migration into others but the 
entire area is not abandoned nor fundamentally altered in its 
interior, but rather one edge fades away as the opposite advances. 
After fifteen years the northwest part is reorganized; there is 
recession all along the east and great protrusion in the middle 
west portion; while the south village expanded in all directions. 
In the town the centre of population moved to the west; 
destruction of some suburbs being compensated for by new 
growths elsewhere. 
Yet the entire occupied area has shrunken while holding 
about the same number of domiciles. 
Before considering possible causes of these shifts in popula- 
tion, some details of change in the northwest region may be 
considered. Of 61 nests mapped in 1905 only 18 were found, of 
these 8 were still active and 10 dead; but three of these had been 
dead in 1905, thus of the 18 found, 8 had continued 15 years and 
7 had failed in that time. Of the 61, 21 were apparently 
deserted in 1905. Thus, of 40 active nests, fifteen years left 7 
remaining as vestiges and 8 as still active. Also there were still 
remaining vestiges of three that were dead in 1905. 
Table of amount of growth in 
6 of the 8 that survived 15 
years. 
Mound No. 
Gain in Height 
In Diameter. 
3 
2 in. 
34 in. 
54 
2 
5 
54 twin 
8 
18 
58 
12 
50 
59 
3 
12 36 N. S. 
60 
9 
18 20 N. S. 
Average 6 
Average 23-27 
