Late Regius Professor of Technology in the University of Edinburgh.

All things were made by Him; and without Him was not anything made that was
made. In Him was life; and the life was the Light of Men.-JOHN i. 3, 4.

London and Cambridge:

PUBLIC

MACMILLAN AND CO.

1862.

TO

JOHN CAIRNS

THESE WRITINGS

OF

THE FRIEND HE SO DEARLY LOVED AND CHERISHED

ARE GRATEFULLY DEDICATED.

Jonathan and David made a covenant, because he loved him as his own soul.