I do not believe they have one species in common;
certainly the general character of the insects is widely different.
If we turn from the land to the sea, we shall find the latter as
abundantly stocked with living creatures as the former is poorly
so. In all parts of the world a rocky and partially protected shore
perhaps supports, in a given space, a greater number of individual
animals than any other station. There is one marine production
which, from its importance, is worthy of a particular history. It
is the kelp, or Macrocystis pyrifera. This plant grows on every
rock from low-water mark to a great depth, both on the outer coast
and within the channels. (11/6. Its geographical range is
remarkably wide; it is found from the extreme southern islets near
Cape Horn, as far north on the eastern coast (according to
information given me by Mr. Stokes) as latitude 43 degrees,--but on
the western coast, as Dr. Hooker tells me, it extends to the R. San
Francisco in California, and perhaps even to Kamtschatka. We thus
have an immense range in latitude; and as Cook, who must have been
well acquainted with the species, found it at Kerguelen Land, no
less than 140 degrees in longitude.
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