A chemist can add a dash of one chemical to a mixture and spark so basic a reaction that it transforms the original into something new and useful.
When yeast is added to dough, a chemical and biological reaction starts, which, under a microscope, looks like a fierce and terrible war. But the process—together with the heat of the oven-transforms the dough into a fluffy loaf of fresh, warm bread.
There's a chemistry of the human character, too. It is not a physical phenomenon basically, but a moral and mental one, although it does indeed affect physical well-being. In both latent and conscious human thought, concepts and qualities often do battle with one another, stirring the lives of men and women individually and collectively.
