8o8 The American Naturalist. [September. 
limit of the Wallaby, and also of the largest of the avian genus Manu- 
codia. Ferguson Island, the largest of the D'Entrecasteaux, probably 
has 500 square miles, and its highest summit, Kilkerran, is 6000 feet. 
Goodenough Island has a range of mountains culminating in two 
peaks not less than 7000 feet high. The peopl: proved quiet and 
friendly, and their houses, built on raised platforms, with curved roofs, 
and tapering from the end nearest the village square, are peculiar. 
GEOLOGY AND PALAEONTOLOGY. 
The American Association for the Advancement of 
Science.— Numerous valuable papers were contributed to the Geo- 
logical Section (E) at the late meeting at Toronto. We are indebted 
to our correspondent. Prof. Joseph F. James, for the following notes 
on some of them. 
Topographic Types of North- Eastern Iowa. By W. J. McGee.— 
This paper was illustrated by a relief map of the section treated of, 
which showed the different character of the drainage channels of the 
district. In the extreme northeast was the dendritic system. In the 
lower portion the most peculiar feature was that the streams, instead of 
following the valleys, followed the ridges, and in them had frequently 
carved deep canons for themselves. The cause of this was that the 
glacial period had so filled the valleys with drift deposits that on the 
retiring of the ice the streams were compelled to seek new channels, 
and these were easiest found along the ridges. 
Glacial Phenomena of Northern Indiana and North-eastern Illinois. 
By Frank Leverett. — The writer detailed his investigations in the 
region in question, and mentioned in particular the moraines which he 
had followed in their windings. He mentioned one moraine which 
was so obscured that it was only by careful barometeric measurement 
that its presence could be detected. .\ profile, however, showed 
plainly the morainic character, with a long, gradual slope on one side, 
moraines were described, and mention made of the very different 
directions from which the materials were derived, even within a small 
" TJie Attractive Sccncn- of Our Ozcn Land,'' was the title of a 
