climb over the narrow neck which connects this formation to the mesa.
It took 45 minutes of hard rowing on a good current to take us around
this one loop. The neck is being rapidly eroded, two hundred feet
having disappeared from the top, and at some distant day will
doubtless disappear entirely, making a short cut for the river, and
will leave a rounded island of rock standing seven hundred feet above
the river. A bird's-eye view of the three loops would compare well in
shape to the little mechanical contrivance known as the "eye" in the
combination of "hook and eye." All women and many men will get a clear
idea the shape of the Double Bow Knot from this comparison.

We recorded an interesting experiment with the thermometer at this
camp, showing a great variety of temperatures, unbelievable almost to
one who knows nothing of conditions in these semi-arid plateaus. A
little ice had formed the night before. Under a clear sky the next day
at noon, our thermometer recorded 54 degrees in the shade, but ran up
to 102 degrees in the sun. At the same time the water in the river was
52 degrees Far. The effect of being deluged in ice-cold waves, then
running into deep sunless canyons with a cold wind sweeping down from
the snow on top, can be easier imagined than described. This is what
we could expect to meet later.

The colouring of the rocks varied greatly in many localities, a light
red predominating. In some places the red rock was capped by a gray,
flint-like limestone; in others this had disappeared, but underneath
the red were regular strata of various-coloured rocks, pink, brown,
light yellow, even blue and green being found in two or three
sections.

The forms of erosion were as varied as the rock itself, each