"As long as men inquire, they will find opportunities to know more upon these topics than those who have gone before them, so inexhaustibly rich is nature in the innermost diversity of her treasures of beauty, order and intelligence."

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In its most primitive form, life is, therefore, no longer bound to the cell, the cell which possesses structure and which can be compared to a complex wheel-work, such as a watch which ceases to exist if it is stamped down in a mortar. No, in its primitive form life is like fire, like a flame borne by the living substance;-like a flame which appears in endless diversity and yet has specificity within it;-which can adopt the form of the organic world, of the lank grass-leaf and of the stem of the tree.

— Martinus Beijerinck