the rivers of China (not Chinese Tartary) contain
Salmon?

If I am right in supposing that the rivers I have pointed out have
no Salmon in them, is it not exceedingly probable that the high
temperature of these southern countries is unsuited to the habits
and uncongenial to the health of these fish? Or how is it when
they are on the same seaboard further north, they don't ascend
these rivers, unless there are some such objections to their doing
so? And if these objections really exist, then do they not equally
exist in the rivers of Australia and Tasmania?

But there may be other objections equally fatal: there may be fish
in their rivers as voracious and destructive as our Pike; there
may be Sharks and other fish in their seas and estuaries, which
would snap up every Salmon that entered them. There may be Seals,
Porpoises, Albatrosses, Man-of-War birds, and Cormorants, as well
as fifty other nameless enemies, all combining their efforts to
defeat so desirable a consummation; and, after all, there may be
no one willing to make himself responsible for a repayment of the
necessary expenses, for corporations and public bodies are
proverbially untrustworthy.

Yet, notwithstanding all these doubts of success, I think the
experiment ought to be made; for its success would confer so great
a boon on the colony in which it was made, that they (the
colonists) ought to incur considerable risk and outlay for the
chance of success, however small. I don't think there will be much
difficulty in carrying fertilized ova there, but when hatched I
fear they would not thrive.

I think New Zealand offers far better chances of success: it is
further from the tropics, it abounds in suitable rivers, the
climate and temperature are more like England, and I believe the
rivers never degenerate into mere water-holes, as they seem to do
in Australia; and I think the residents of that colony ought to
make a vigorous attempt to introduce Salmon, Salmon Trout, and the
common brown Trout into their rivers immediately; and I should be
delighted to render all the assistance in my power to accomplish
so desirable an object.

* * * * *

ON THE FORMATION OF ICE AT THE BOTTOM OF RIVERS.

_Anchor Frosts._

A correspondent of the "Magazine of Natural History," in
endeavouring to explain the causes why water freezes at the bottom
in rapid streams, says this unusual phenomenon may be rationally
accounted for by anyone who has attended to it; that t