As a historian and philosopher of science, I am interested in the process of the construction of new scientific theories. The hypothesis to be explored in this paper is that analogies may play an important role in the generation of new ideas that are built into new theories. In order to make clear the locus of my discussion, I would like to present an over-simplified view of the levels of organization of scientific knowledge. The three levels are the following: data, empirical generalizations, and explanatory theories. At the lowest level of generality are the data, particular statements about, particular facts. For example, if we consider data from genetics, in a cross between a yellow pea plant and a green pea plant, all the peas of the first generation of hybrids are yellow; if the hybrids are self-fertilized, the second hybrid generation has a ratio of three yellow peas to one green pea.
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