which position is now exclusively used in the stellar statistical investigations at the Observatory of Lund and is also used in these lectures. The galactic longitude (_l_) is reckoned from the ascending node of the Milky Way on the equator, which is situated in the constellation _Aquila_. The galactic latitude (_b_) gives the angular distance of the star from the Galaxy. On plate I, at the end of these lectures, will be found a fairly detailed diagram from which the conversion of α and δ of a star into _l_ and _b_ may be easily performed. All stars having an apparent magnitude brighter than 4m are directly drawn. Instead of giving the galactic longitude and latitude of a star we may content ourselves with giving the galactic _square_ in which the star is situated. For this purpose we assume the sky to be divided into 48 squares, all having the same surface. Two of these squares lie at the northern pole of the Galaxy and are designated GA_1 and GA_2. Twelve lie north of the galactic plane, between 0° and 30° galactic latitude, and are designated GC_1, GC_2, ..., GC_12. The corresponding squares south of the galactic equator (the plane of the Galaxy) are called GD_1, GD_2, ..., GD_12. The two polar squares at the south pole are called GF_1 and GF_2. Finally we have 10 B-squares, between the A- and C-squares and 10 corresponding E-squares in the southern hemisphere. The distribution of the squares in the heavens is here graphically represented in the projection of FLAMSTEED, which has the advantage of giving areas proportional to the corresponding spherical areas, an arrangement necessary, or at least highly desirable, for all stellar statistical researches. It has also the advantage of affording a continuous representation of the whole sky. The correspondence between squares and stellar constellations is seen from plate II. Arranging the constellations according to their galactic longitude we find north of the galactic equator (in the C-squares) the constellations:-- Hercules, Cygnus, Cepheus, Cassiopæa, Auriga, Gemini, Canis Minor, Pyxis, Vela, Centaurus, Scorpius, Ophiuchus, and south of this equator (in the D-squares):-- Aquila, Cygnus, Lacerta, Andromeda, Perseus, Orion, Canis Major, Puppis, Carina, Circinus, Corona australis, Sagittarius, mentioning only one constellation for each square. At the north galactic pole (in the two A-squares) we have:-- Canes Venatici and Coma Berenices, and at the south galactic pole (in the two F-squares):-- Cetus and Sculptor.