Mr.
Windsor Earl makes much of this theory, but, unfortunately for it, the tree-kangaroos are chiefly found in the northern peninsula of New Guinea, which is entirely composed of hills and mountains with very little flat land, while the kangaroo of the low flat Aru Islands (Dorcopsis asiaticus) is a ground species.

A more probable supposition seems to lie, that the tree-kangaroo has been modified to enable it to feed on foliage in the vast forests of New Guinea, as these form the great natural feature which distinguishes that country from Australia.
On June 5th, the coal-ship arrived, having been sent back from Amboyna, with the addition of some fresh stores for the steamer.

The wood, which had been almost all taken on board, was now unladen again, the coal taken in, and on the 17th both steamer and tender left for Humboldt Bay.
We were then a little quiet again, and got something to eat; for while the vessels were here every bit of fish or vegetable was taken on board, and I had often to make a small parroquet serve for two meals.

My men now returned from Amberbaki, but, alas brought me almost nothing.

They had visited several villages, and even went two days' journey into the interior, but could find no skins of Birds of Paradise to purchase, except the common kind, and very few even of those.