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may be said to be almost wholly unknown. Until I tried, with Mr.
aid, a few experiments, it was not even known how far seeds could resist the
action of sea-water. To my surprise I found that out of 87 kinds, 64 germinated after an immersion of 28 days, and a few survived an immersion of 137 days. It deserves notice that certain orders were far more
than others: nine Leguminosæ were tried, and, with one exception, they resisted the salt-water badly; seven species of the allied orders, Hydrophyllaceæ and
were all killed by a
immersion. For
sake I chiefly tried small seeds, without the capsule or fruit; and as all of these sank in a few days, they could not
floated across wide spaces of the sea, whether or not they were injured by the salt-water. Afterwards I tried some larger fruits, capsules,
and some of these floated for a long time. It is well known what a difference there is in the buoyancy of green and seasoned timber; and it occurred to me that floods
→might wash down
plants or
→and that these might be dried on the banks, and then by a fresh rise in the stream be washed into the sea. Hence I was led to dry
and branches of 94 plants with ripe fruit, and to place them on
The majority sank quickly, but
whilst
floated for a very short time, when dried floated much longer; for instance, ripe hazel-nuts sank immediately, but when
they floated for 90
and afterwards when planted
germinated; an
with ripe berries floated for 23 days, when dried it floated for 85 days, and the seeds afterwards
the ripe seeds of Helosciadium sank in two days, when dried they floated for above 90 days, and afterwards germinated.
out of the 94 dried plants, 18 floated for above 28
and some of the 18 floated for a
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