LET THEORY GUIDE OBSERVATIONS. “How odd it is that anyone should not see that all observation must be for or against some view if it is to be of any service!” Let theory guide your observations.” Indeed, Darwin had no use for the empiricist claim that a scientist should not have a preconception or hypothesis that would guide his work. Otherwise, as he wrote, one “might as well go into a gravel pit and count the pebbles and describe the colors.”
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