English translation of De solido intra solidum naturaliter contento dissertationis prodromus (1st Latin ed., 1669). Frontispiece, vii, pp. 169-283; plates v-x (Frontispiece = Plate v). Original wrappers. Very Good. '[H]is great work . . . which outlines the principles of modern geology . . . presents only the outline of a discussion, yet almost every sentence or paragraph contains new insights. After an introductory methodological discussion, Stensen states his purpose: 'to find, in the case of a body possessed of a certain shape and produced on the basis of natural laws, the proofs in the body itself which reveal the site and the type of its origin.' There follow three important sections: the first concerning the relationship in time between the enclosing body and the body enclosed; the second, the determination of the site and origin of a solid body, and the third, the role of fluids in nature. . . . A glance back to the first main part of the Prodromus shows the value of Stensen's m