PHYSIOLOGY. By Professor A. Macalister, LL.D., M.D., F.R.S., F.S.A.

GEOLOGY. By the Rev. T. G. Bonney, M.A., F.G.S.

ASTRONOMY. By W. H. Christie, M.A., F.R.S.

BOTANY. By the late Professor Robert Bentley.

ZOOLOGY. By Alfred Newton, M.A., F.R.S., Professor of Zoology in the University of Cambridge. New Revised Edition.

MATTER AND MOTION. By the late J. Clerk Maxwell, M.A., Trinity College, Cambridge.

SPECTROSCOPE (THE), AND ITS WORK. By the late Richard A. Proctor.

CRYSTALLOGRAPHY. By Henry Palin Gurney, M.A., Clare College, Cambridge.

ELECTRICITY. By the late Prof. Fleeming Jenkin.