On the Origin of the Solar System.

Reply is made in the present paper to Lyttleton's article on the origin of the solar system, more specifically on the point raised by him in connection with the amount of planetary matter available for capture. While the objection made by him to the previous calculations of Hill and myself is ad- raitted to be valid in principle, it is shown that, numerically, it makes the case for his theory much more adverse, reducing the amount of matter available for capture from an assumed 6 per cent before to less than o.6 per cent at most. The conclusion reached before, that Lyttleton's theory is dynamically untenable, is ther~f ore maintained