ting the
processes going on in a concentrating nebulous spheroid; the general
outcome of which is implied in Note III of the foregoing essay. I do not
reproduce it because, not having the guidance of Prof. Andrew's
researches, I had concluded that the formation of a molten shell would
occur universally, instead of occasionally, as is now argued in the
note named. The essay then proceeded thus:--]

The process of condensation being in its essentials the same for all
concentrating nebular spheroids, planetary or solar, it was argued that
the Sun is still passing through that incandescent stage which all the
planets have long ago passed through: his later aggregation, joined with
the immensely greater ratio of his mass to his surface, involving
comparative lateness of cooling. Supposing the sun to have reached the
state of a molten shell, inclosing a gaseous nucleus, it was concluded
that this molten shell, ever radiating its heat, but ever acquiring
fresh heat by further integration of the Sun's mass, must be constantly
kept up to that temperature at which its substance evaporates.

[Here followed part of the paragraph quoted in the preceding essay on p.
155; and there succeeded, in subsequent editions, a paragraph aiming to
show that the inferred structure of the Sun's interior was congruous
with the low specific gravity of the Sun--a conclusion which, as
indicated on p. 156, implies some very problematical assumptions
respecting the natures of the unknown elements of the Sun. There then
came this passage:--]

The conception of the Sun's constitution thus set forth, is like that of
M. Faye in so far as the successive changes, the resulting structures,
and the ultimate state, are concerned; but unlike it in so far as the
Sun is supposed to have reached a later stage of concentration. As I
gather from your abstract of M. Faye's paper [this referred to an
article in _The Reader_], he considers the Sun to be at present a
gaseous spheroid, having an envelope of metallic matters precipitated in
the shape of luminous clouds, the local dispersions of which, caused by
currents from within, appear to us as spots; and he looks forward to the
future formation of a liquid film as an event that will soon be followed
by extinction. Whereas the above hypothesis is that the liquid film
already exists beneath the visible photosphere, and that extinction
cannot result until, in the course of further aggregation, the gaseous
nucleus has