In the Days of Queen Mary

by E. E. Crake

RADIUM AND RADIO-ACTIVITY. By A. T. Cameron, M.A., B.Sc. 2s. 6d. net.

SOAP-BUBBLES, AND THE FORCES WHICH MOULD THEM. By C. V. Boys, A.R.S.M., F.R.S. 2s. 6d. net.

SOUNDING THE OCEAN OF AIR. Lectures by A. Lawrence Rotch, S.B., A.M. 2s. 6d. net.

SPINNING-TOPS. By Professor J. Perry, M.E., F.R.S. 2s. 6d. net.

TIME AND TIDE: A Romance of the Moon. By Sir Robert S. Ball, Fourth Edition, revised. 2s. 6d. net.

THE MACHINERY OF THE UNIVERSE. Mechanical Conceptions of Physical Phenomena. By Professor A. E. Dolbear, A.B., A.M., M.E., Ph.D. 2s. net.

THE STORY OF A TINDER-BOX. By the late C. Meymott Tidy, M.B., M.S. 2s. net.

THE BIRTH AND GROWTH OF WORLDS. A Lecture by the late Professor A. H. Green, M.A., F.R.S. 1s. net.

THE NEW STATE OF MATTER. By Professor H. Pellat, Translated by Edmund McClure, M.A. 1s. net.

THE PRESSURE OF LIGHT. By J. H. Poynting, Sc.D., F.R.S. 2s. net.