The previous theory had been that stars started as nebule and gradually became white stars, and on further contraction yellow and. ted stars. Russell'; theory was ut an ascending and descending scale. On the ascending scale all stars were of equal brightness, but as they diminished the brightness varied considerably. The red dwarfs gave a heat of 3,000 degrees from the surface layer. The heat from the sun was 6,009 degrees.
But there need be little fear that our sun was contracting rapidly towards extinction. Lord Kelvin had given the age of the sun as less than 100 million years. That was of no use to biologists, But there was.a purely speculative theory put forward by Dr, Aston, of Cambridge, who was investigating the nature of the elements. Helium and hydrogen were in the brightest stars. But the atomic weight of hydrogen was 1,008. And the theory was that the extra.032
able to keep up the heat of stars. supplied the ete rey that was avail-In this the biologists might find satisfaction.
Text read from the printed page and cleaned; old type leaves the occasional error.