256 IOWA STUDIES IN NATURAL HISTORY 
rim almost a half-mile in circumference, gave evidence of the 
mighty upheaval which had occurred in past ages. It was very 
eold and windy at the summit and we did not tarry there long. 
Near Auckland one of the most interesting places in which to 
collect insects was a hilly preserve of 217 acres known as ‘‘The 
Domain’’ in which both native and introduced trees abound. 
Among the latter are many oaks whose fallen leaves covered the 
ground thickly. But for the green native trees and tree ferns we 
might have thought ourselves enjoying the late October days in 
Towa. Numerous trails lead here and there through the harsh 
grasses. Rotten logs and stumps offer retreat for many kinds of 
insects. The ground is always moist in the denser parts of the 
preserve. 
Another day I visited Mt. Eden and One Tree Hill, two vol- 
canic craters near Auckland; both are maintained as preserves. 
The former is about five hundred feet high and from its summit 
a fine view of the city, harbor and surroundings is presented. Its 
very symmetrical crater is about five hundred feet across, one 
hundred fifty feet deep, and the grassy sides are very steep. We 
climbed and slid down into this ancient pit, the bottom of which 
is covered with seoria and ‘‘bombs,’’ some of which we overturned 
in search of terrestrial arthropods; millipedes, centipedes and 
spiders were common. 
One Tree Hill, some two miles away, bears on its erest not a 
single tree as its name suggests, but five trees. A series of broad 
grassy terraces leads to the summit from which an excellent view 
of the surrounding country may be obtained. Here also is buried 
the donor of this preserve, Sir John Logan Campbell, who died 
June 22, 1912. His grave is covered by a marble slab and sur- 
rounded by an iron fence. Although the crater is larger than the 
one at Mt. Eden it is not so symmetrical. At one side, a deep flat 
valley leads away from it as if the ancient lava flow might have 
occurred there. 
Never have I seen earth phenomena better illustrated than in 
these two huge craters and their surroundings; terraces, valleys, 
slight depressions, great flat tables, scoria, bombs,—all give evi- 
dence of the mighty activities of vuleanism. 
Triangulation stations have been erecetd on the summits of many 
of these old craters. 
- Still another point of interest and a place where we found good 
collecting was Kauri Gully, a forest preserve of sixty acres, across 
