CONTENTS 



Page 



1. Introduction. Instrumental Constants 3 



2. Plate Material 4 



3. The iMeasuring of tlie Plates 7 



4. Reduction of tlie Effective Wavelengths to the same Intensity of the Image 9 



5. Precision of the Effective Wavelengths 11 



6. Determination of Approximate Magnitudes 12 



7. The Coordinates 13 



8. Spectra of the Ilnti Order 13 



9. Spectra of the IIKd Order 14 



10. Relation between Effective Wavelength and Colour Index 15 



11. Relation between the Effective Wavelengths found from the Spectra of the I*', Il^d and 111"' 

 Order 17 



12. Detailed Example of the Measures of Star No. 508 17 



13. Other Determinations of Colour Equivalents of Stars in the Pleiades 19 



14. Relation between Brightness and Colour of tlie Physical Members and Hypothetical Parallaxes 



of the Pleiades 19 



15. The Colours of Stars not Physically belonging to the Pleiades 29 



16. Double and Neighbouring Stars 31 



17. General Catalogue. . 33 



18. The Map 34 and Table 



I 



