The buoyancy of carbon vapor is one of its most remarkable characteristics. Accordingly immense volumes of the carbon steam in the sun soar at a higher level than do the vapors of the other elements. Thus carbon becomes a very large and important constituent of the more elevated regions of the solar atmosphere. We can understand what happens to these carbon vapors by the analogous case of the familiar clouds in our own skies. It is true, no doubt, that our terrestrial clouds are composed of a material totally different from that which constitutes the solar clouds. The sun evaporates the water from the great oceans which cover so large a proportion of our earth. The vapor thus produced ascends in the form of invisible gas through our atmosphere, until it reaches an altitude thousands of feet above the surface of the earth. The chill that the watery vapor experiences up there is so great that the vapor collects into little liquid beads, and it is, of course, these liquid beads, associated in countless myriads, which form the clouds we know so well. We can now understand what happens as the buoyant carbon vapors soar upwards through the sun's atmosphere. They attain at last to an elevation where the fearful intensity of the solar heat has so far abated that, though nearly all other elements may still remain entirely gaseous, yet the exceptionally refractory carbon begins to return to the liquid state. At the first stage in this return, the carbon vapor conducts itself just as does the ascending watery vapor from the earth when about to be transformed into a visible cloud. Under the influence of a chill the carbon vapor collects into a myriad host of little beads of liquid. Each of these drops of liquid carbon in the glorious solar clouds has a temperature and a corresponding radiance vastly exceeding that with which the filament glows in the incandescent electric lamp. When we remember further that the entire surface of our luminary is coated with these clouds, every particle of which is thus intensely luminous, we need no longer wonder at that dazzling brilliance which, even across the awful gulf of ninety-three millions of miles, produces for us the indescribable glory of daylight. _Sir Robert Ball will contribute a series of articles on "The Marvels of the Universe." Six or eight of these articles may be expected during the coming year_. [Illustration: THEOLOGICAL SEMINARY BUILDINGS, ANDOVER, MASSACHUSETTS.] CHAPTERS FROM A LIFE. BY ELIZABETH STUART PHELPS, AUTHOR OF "THE GATES AJAR," "THE MADONNA OF THE TUBS," ETC. LIFE IN ANDOVER BEFORE THE WAR. Andover is--or Andover was--like the lady to whom Steele gave immortality in the finest and most famous epigram ever offered to woman.