It is well known that radiation of all kinds, including light, heat, and electrical emissions, varies in direct proportion to the exposed surface, that is, as the square of the radius of a sphere, and inversely as the square of the distance. From black bodies, as we have seen, the total radiation varies as the fourth power of the absolute temperature. It is not certain that either light or electrical emissions from incandescent bodies vary in quite this same proportion, nor is it yet certain whether luminous and electrical emissions vary exactly together. Nevertheless they are closely related. Since the light coming from each star is accurately measured, while no information is available as to electrical emissions, we have followed Dr. Shapley's suggestion and used the luminosity of the stars as the best available measure of total radiation. This is presumably an approximate measure of electrical activity, provided some allowance be made for disturbances by outside bodies such as companion stars. Hence the inclusion of column 14. TABLE 6 THIRTY-EIGHT STARS HAVING LARGEST KNOWN PARALLAXES Star Code 1 Groombr. 34 2 ++[Greek: e] Cassiop. 3 4 ++[Greek: k] Tucanae 5 [Greek: t] Ceti 6 [Greek: d]_2 Eridani 7 ++[Greek: e] Eridani 8 ++40(0)^2 Eridani 9 Cordoba Z. 243 10 Weisse 592 11 ++[Greek: a] Can. Maj. (Sirius) 12 ++[Greek: a] Can. Min. (Procyon) 13 ++Fedorenko 1457-8 14 Groombr. 1618 15 Weisse 234 16 Lalande 21185 17 Lalande 21258 18 19 Lalande 25372 20 ++[Greek: a] Centauri 21 ++[Greek: x] Bootes 22 ++Lalande 27173 23 Weisse 1259 24 Lacaille 7194 25 ++[Greek: b] 416 26 Argel -0.17415-6 27 Barnard's star 28 ++70p Ophiuchi 29 ++[Greek: S] 2398 30 [Greek: s] Draconis 31 ++[Greek: a] Aquilae (Altair) 32 ++61 Cygni 33 Lacaille 8760 34 [Greek: e] Indi 35 ++Krueger 60 36 Lacaille 9352 37 Lalande 46650 38 C. G. A. 32416 (++ Double star.)