M. Stratonoff finds that stars having spectra of the Orion and Sirian types--supposed to represent an early stage in stellar evolution--tend to congregate in or near the Milky Way. Star clusters in general show a similar tendency, "but to this law the globular clusters form an exception."[299] We may add that the spiral nebulæ--which seem to be scattered indifferently over all parts of the sky--also seem to form an exception; for the spectra of these wonderful objects seem to show that they are really star clusters, in which the components are probably relatively small; that is, small in comparison with our sun. If we accept the hypothesis that suns and systems were evolved from nebulæ, and if we consider the comparatively small number of nebulæ hitherto discovered in the largest telescopes--about half a million; and if we further consider the very small number of red stars, or those having spectra of the third and fourth types--usually considered to be dying-out suns--we seem led to the conclusion that our sidereal system is now at about the zenith of its life-history; comparatively few nebulæ being left to consolidate into stars, and comparatively few stars having gone far on the road to the final extinction of their light. Prof. Boss of Albany (U.S.A.) finds that about forty stars of magnitudes from 3½ to 7 in the constellation Taurus are apparently drifting together towards one point. These stars are included between about R.A. 3{h} 47{m} to 5{h} 4{m}, and Declination + 5° to + 23° (that is, in the region surrounding the Hyades). These motions apparently converge to a point near R.A. 6{h}, Declination + 7° (near Betelgeuse). Prof. Boss has computed the velocity of the stars in this group to be 45·6 kilometres (about 28 miles) a second towards the "vanishing point," and he estimated the average parallax of the group to be 0"·025--about 130 years' journey for light. Although the motions are apparently converging to a point, it does not follow that the stars in question will, in the course of ages, meet at the "vanishing point." On the contrary, the observed motions show that the stars are moving in parallel lines through space. About 15 kilometres of the observed speed is due to the sun's motion through space in the opposite direction. Prof. Campbell finds from spectroscopic measures that of these forty stars, nine are receding from the earth with velocities varying from 12 to 60 kilometres a second, and twenty-three others with less velocities than 38 kilometres.[300] It will be obvious that, as there is a "vanishing point," the motion in the line of sight must be one of _recession_ from the earth. It has been found that on an average the parallax of a star is about one-seventh of its "proper motion."[301]