Sir Norman Lockyer and Spectroscopic Studies of the Sun and Stars, p.
73--Observations made at South Kensington by Sir Norman and his staff,
p. 74--His theories as to the influence of sun-spots and terrestrial
weather, p. 75--Spectroscopic studies of sun-spots, p. 76--Studies of
the so-called reverse lines of the spectrum, p. 78--Discovery of the new
star in the constellation of Perseus, p. 80--Spectroscopic studies
of the new star, p. 81--Professor Ramsay and the new gases, p.
82--University College in London, p. 83--Professor Ramsay's laboratory
and its equipment, p. 84--The discovery of argon, p. 86--Professor
Ramsay's work on krypton, neon, and zenon, p. 87--Discoveries of new
constituents of the atmosphere, p. 88--Interesting questions raised
by these discoveries, p. 89--Professor J. J. Thomson and the nature
of electricity, p. 92--Study of gases in relation to the conduction
of electricity, p. 93--Electricity regarded as a form of matter, p.
97--Radio-activity, p. 97--The nature of emanations from radio-active
bodies, p. 10a--The source of energy of radioactivity, p.
106--Radio-activity and the structure of the atom, p. 108--Effect of
radio-activity upon heat-giving life of the sun and the earth, p. 111.