In the scientific region of her duty of which we speak, the Imagination cannot have her perfect work; this belongs to another and higher sphere than that of intellectual truth--that, namely, of full-globed humanity, operating in which she gives birth to poetry--truth in beauty. But her function in the complete sphere of our nature, will, at the same time, influence her more limited operation in the sections that belong to science. Coleridge says that no one but a poet will make any further _great_ discoveries in mathematics; and Bacon says that “wonder,” that faculty of the mind especially attendant on the child-like imagination, “is the seed of knowledge.” The influence of the poetic upon the scientific imagination is, for instance, especially present in the construction of an invisible whole from the hints afforded by a visible part; where the needs of the part, its uselessness, its broken relations, are the only guides to a multiplex harmony, completeness, and end, which is the whole. From a little bone, worn with ages of death, older than the man can think, his scientific imagination dashed with the poetic, calls up the form, size, habits, periods, belonging to an animal never beheld by human eyes, even to the mingling contrasts of scales and wings, of feathers and hair. Through the combined lenses of science and imagination, we look back into ancient times, so dreadful in their incompleteness, that it may well have been the task of seraphic faith, as well as of cherubic imagination, to behold in the wallowing monstrosities of the terror-teeming earth, the prospective, quiet, age-long labour of God preparing the world with all its humble, graceful service for his unborn Man. The imagination of the poet, on the other hand, dashed with the imagination of the man of science, revealed to Goethe the prophecy of the flower in the leaf. No other than an artistic imagination, however, fulfilled of science, could have attained to the discovery of the fact that the leaf is the imperfect flower.