This volume collects my shorter articles on the history of mechanics,
some already published in various places, some revised from earlier
papers, and some never published before. All of them began as lectures,
and here they are printed as such, little changed from the last times I
read them out to an audience. While the several articles concern
different aspects of mechanics, overlap and even some repetition could
not be avoided, since mechanics is one great science, and the same
original oftentimes served more than one end in its growth. My three
major historical treatises, which were published in Volumes (II) 11, 2
12, and 13 of L. Euleri Opera Omnia, are not included. To simplify the
printing I have also mostly omitted detailed reference to sources
discussed more fully in those treatises, but of course I have added to
the texts of the lectures citations of other sources, some notes in
answer to questions a reader might ask, and biblio- graphical notes at
the end of each. I am grateful to the U.S. National Science Foundation
for its support of this work through a grant to The Johns Hopkins
University.