Nova Acta Heg. Soc. Sc. Ups. Ser. 4. Vol. 4. N. 7. Plate I. 
1 a. Apparent distribution of the stars of the spectral type B. 
Total number: 804. 
n « 12 12-23 24-35 36-41 48-59 
C. V. L. Charlier. Lith. L. Ljunggren. 
