PIIYSIC A L G E 0 GBAPHY. 
continuous rapid, the many rocks in its bed confining the water in 
deep channels, which render it unsafe to ford it. At the end of 
tins south-westerly reach, another small river enters it from the 
south-south-east, flowing through a valley almost a mile broad, and 
draining the mountain ranges between the Ahaura and the Grey. 
Ibe Grey now, instead ot following the line of depression in the 
mountains, which continues towards the south-south-west, and 
stretches to the banks ot the Ahaura, makes a sudden turn 
towards the north-north-west, and flows for five miles through a 
large valley, clothed on both sides with scrub and grass, offering 
in its course several good lords. Its direction then again changes, 
becoming nearly west, with only a slight tendency to the 
northward ; the valley too becomes narrower, and the river winds 
between the numerous spurs 'which slope from the mountains on 
both sides. Between these spurs is a terrace about 200 feet high, 
which is broken through by streamlets flowing from the gullies 
formed by the spurs. After following this course for two miles 
the valley again widens, and the Alexander stream joins the Grey 
from the north, bringing down the greater part of the waters of 
the high rocky ranges which lie between the Grey and the 
sources of the Inangahua. This stream, which has a remarkably 
straight course, is separated by a narrow and 1 ow saddle from the 
Inangahua, and also drains in its course the two isolated mountains 
which here border the Grey plains, and w r ere named by Mr. 
Mackay, Conical Hill and Mount Gore. The last-named one 
is 4,500 feet high, and the Inangahua, after having skirted its 
south-eastern and southern bases, then enters the plains. The 
Pohaturoha, on leaving the mountains, flows partly through deep 
precipitous gorges, and partly through open land round Black-hill, 
which, with the continuation of the chain to the south-west, forms 
the boundary range on that side of the plains. 
Four miles from the Alexander stream, on a south-west course, 
we meet a stream from the south-east, which I named the 
Robinson, and which drains, to a considerable extent, the ranges 
between the Grey and Ahaura. On its southern side commences 
the rocky range named by me the Herschel mountains, distin¬ 
guished by the ruggedness of their outline. The Grey, after 
receiving the Bobinson, flows thirteen miles west-north-west, 
during which its bed widens, large shingle beds appear, grassy 
terraces replace the dense bush, and the explorer, instead of 
toiling through the tangled vegetation ot the torest, can avail 
himself, by occasionally crossing over shallow rapids, of long 
reaches of shingle. X o stream, or even ri vulet of any size, enters 
the Grey between the Robinson and the Mawhera-iti, which 
latter conveys the waters irom the Paparoha range. Ascending 
this last-mentioned stream, the brown coloured waters of which 
show that it drains considerable tracts of swampy ground, we find 
that the greater part of its waters are derived from the western 
