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Sir, You, who study nature in an eminent degree, view her in all her works proceeding by regular gradations from the lowest to the most perfect of all created beings; among those animals commonly called zoophytes, you may plainly discover an evident approximation, from the rudest irregularly-formed sponge (which is the lowest being that I have yet observed to have the appearance of animal life) to the most beautiful and elegant red coral.

XXXI. On the nature and formation of sponges: In a letter from John Ellis, Esquire, F. R. S. to Dr. Solander, F. R. S