Microbiologists brought the “Cycle of Life” into an entirely new realm. Ferdinand Cohn categorized Nature’s “smallest beings” by correlating their shapes—spirals, rods, and spheres—with their environment. Louis Pasteur ignored systematics and investigated the roles that the “infinitely small” play in natural processes such as fermentation. Both were informed by Claude Bernard’s physiological notion of “reciprocal harmony.”
	ADD Ferdinand Cohn
	Claude Bernard, De la Physiologie generale, 1872; and Lecons sur les Phenomens de la vie, 1879
	Louis Pasteur, Etudes sur la Biere, 1860