24 FEBRUARY 1923, Page 22

OUR SOLAR SYSTEM AND THE STELLAR UNIVERSE. By that Rev.

C. Whyte, LL.D., F.R.A.S., F.R.S.E. (Griffin and Co. 10s. 6d. net.)

In these ten popular lectures Mr. Whyte gives a very com- prehensive and readable survey of the latest results of astro- nomical research and the methods of obtaining them. As the solar system is too near to be interesting, the second half of the book, dealing with the stellar universe, will probably be the more appreciated. For there the author satisfies any possible craving for mystery or vastness in his descriptions of the shape and extent of the galactic system, the latest theories of stellar evolution—such as Russell's Giant and Dwarf theory—the formation of stellar clusters, and last and most intriguing of all, the nature of the spiral nebulae, and whether or not they are to be considered as external or Island Universes.