Excerpt from The Development and Present Aspects of Stereo-Chemistry Aspects Stereo-Chemistry
Since the introduction of the Atomic Theory, great advances have already been made in the definiteness of our conceptions in regard to the internal structure of molecules, and it is largely to the study of the phenomenon of isomerism that this growth is due. There has been a gradual evolution of ideas from the vague conception of matter as continuous, to the idea of matter as made up of definite molecules, separate and distinct, then of these molecules as made up of a definite number of separate and distinct atoms, and finally, through the study of isomerism, to the idea of these atoms as possessing a definite arrangement in the molecule, one atom being directly joined to another, forming a kind of chain. It is this last conception which has given us our ordinary structural formulas; and we must certainly feel that it is a great triumph of human ingenuity when we are enabled to determine the method of atomic linking from a study of the chemical reactions of the body in question.
But the study of isomerism leads us a step further, and gives us a glimpse, at least, of the possible arrangement of the atoms in space, and the geometrical forms which groups of combined atoms assume.
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