Elements of Early Modern Physics comprises the two long introductory chapters of J. L. Heilbron's monumental work Electricity in the 17th and 18th Centuries: A Study of Early Modern Physics plus a concluding summary of the remaining chapters. Heilbron opens with a presentation of the general principles of physical theory and a description of the institutional frameworks in which physics were cultivated in the seventeenth and eighteenth centuries. He argues that the single most important contributor to physics in the seventeenth century was the Catholic Church. In the first half of the eighteenth century, Cartesian and Newtonian physicists disagreed over principles but thought in similar terms and cultivated the same sort of qualitative natural philosophy. Work towards an exact physics, which took on important dimensions after 1770, confounded the programs of both. Heilbron shows that by attending too closely to the Copernican revolution and the confrontation of great philosophical systems, historians have seriously misjudged the character of early modern science.