shall be a Sabbath, whether you are in a sabbatical mood or not.
All the more reason for keeping one day holy, as a pattern of what
all days should be.' So we will be glad if the Negro has got thus
far, as an earnest that he may some day get farther still.

That night, however, he kept no Sabbath, and we got no sleep; and
were glad enough, before sunrise, to escape once more to the cove we
had visited the evening before; not that it was prettier or more
curious than others, but simply because it is better, for those who
wish to learn accurately, to see one thing twice than many things
once. A lesson is never learnt till it is learnt over many times,
and a spot is best understood by staying in it and mastering it. In
natural history the old scholar's saw of 'Cave hominem unius libri'
may be paraphrased by 'He is a thoroughly good naturalist who knows
one parish thoroughly.'

So back to our little beach we went, and walked it all over again,
finding, of course, many things which had escaped us the night
before. We saw our first Melocactus, and our first night-blowing
Cereus creeping over the rocks. We found our first tropic orchid,
with white, lilac, and purple flowers on a stalk three feet high.
We saw our first wild pines (Tillandsias, etc.) clinging parasitic
on the boughs of strange trees, or nestling among the angular limb-
like shoots of the columnar Cereus. We learnt to distinguish the
poisonous Manchineel; and were thankful, in serious earnest, that we
had happily plucked none the night before, when we were snatching at
every new leaf; for its milky juice, by mere dropping on the skin,
burns like the poisoned tunic of Nessus, and will even, when the
head is injured by it, cause blindness and death. We gathered a
nosegay of the loveliest flowers, under a burning sun, within ten