Huxley By Professor G.Leighton, M.D.
24.

Sir W.Huggins and Spectroscopic By E.W.Maunder, F.R.A.S., of Astronomy the Royal Observatory, Greenwich.
*62.

Practical Astronomy By H.Macpherson, Jr., F.R.A.S.
*63.

Aviation By Sydney F.Walker, R.N., M.I.E.E.
*64.

Navigation By W.Hall, R.N., B.A.
*65.