DURING the last decade of Peter Cooper's life, the writer of this biographical sketch enjoyed some degree of intimacy with him, as professional adviser and traveling companion, and also, incidentally, as consulting engineer of the firm of Cooper and Hewitt, and manager of a department in the Cooper Union. This circumstance, together with the preference kindly expressed by Mr. Cooper's family, doubtless influenced the selection of the writer for the honorable task of preparing this book, -a task which was welcome as a labor of love, though the execution of it has been hindered and impaired by the demands of other duties. The real difficulty has been to compress within the prescribed limits a story covering so many years and so many topics, yet not possessing those features of dramatic action or adventure which could be treated briefly, with picturesque effect