by bluffs,
as they call the short intervals of high ground. The town of Natchez is
beautifully situated on one of those high spots. The contrast that
its bright green hill forms with the dismal line of black forest that
stretches on every side, the abundant growth of the pawpaw, palmetto
and orange, the copious variety of sweet-scented flowers that flourish
there, all make it appear like an oasis in the desert. Natchez is the
furthest point to the north at which oranges ripen in the open air,
or endure the winter without shelter. With the exception of this
sweet spot, I thought all the little towns and villages we passed
wretched-looking in the extreme.'

Natchez, like her near and far river neighbors, has railways now, and is
adding to them--pushing them hither and thither into all rich outlying
regions that are naturally tributary to her. And like Vicksburg and New
Orleans, she has her ice-factory: she makes thirty tons of ice a day.
In Vicksburg and Natchez, in my time, ice was jewelry; none but the rich
could wear it. But anybody and everybody can have it now. I visited one
of the ice-factories in New Orleans, to see what the polar regions
might look like when lugged into the edge of the tropics. But there was
nothing striking in the aspect of the place. It was merely a spacious
house, with some innocent steam machinery in one end of it and some big
porcelain pipes running here and there. No, not porcelain--they merely
seemed to be; they were iron, but the ammonia which was being breathed
through them had coated them to the thickness of your hand with solid
milk-white ice. It ought to have melted; for one did not require winter
clothing in that atmosphere: but it did not melt; the inside of the pipe
was too cold.

Sunk into the floor were numberless tin boxes, a foot square and two
feet long, and open at the top end. These were full of clear water;
and around each box, salt and other proper stuff was packed; also, the
ammonia gases were applied to the water in some way which will always
remain a secret to me, because I was not able to understand the process.
While the water in the boxes gradually froze, men gave it a stir or two
with a stick occasionally--to liberate the air-bubbles, I think. Other
men were continually lifting out boxes whose contents had become hard
frozen. They gave the box a single dip into a vat of boiling water, to
melt the block of ice free from its tin coffin, then they shot the block
out