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I was concluding my essay on the sea anemonies inserted in the LXIIId volume of the Philosophical Transactions, when I discovered a fourth species of that animal of which I could not at that time take a drawing; and I have reason to think, that I have since observed a fifth species. New observations have encreased the number of my experiments: my ideas have been enlarged, my views extended; and the phænomena crowd in so fast upon me that I dare not flatter myself with the hopes of ever arriving at the end of this pursuit. The scarcity of high tides, the vicissitudes of seasons, and other similar impediments, make it less wonderful that a series of years should often elapse before it is possible to present the curious with any discoveries of which they might avail themselves, either by analysis, combination, or analogy, and thereby furnish general views and a chain of ideas leading to a new field of discovery, the usual effect of contemplation. I shall here endeavour as briefly as possible, to communicate some of the ideas that have been suggested to me by my last experiments.

XVI. A second essay on the natural history of the sea-anemonies.