PROCEEDINGS 



OF 



THE ROYAL SOCIETY. 



April 12, 1888. 



Professor Gr. G. STOKES, D.C.L., President, in the Chair. 



The Presents received were laid on the table, and thanks ordered 

 for them. 



The Bakerian Lecture was delivered as follows : — 



The Bakerian Lecture. — " Suggestions on the Classification 

 of the various Species of Heavenly Bodies." A Report to 

 the Solar Physics Committee. Communicated at the 

 request of the Committee. By J. Norman Lockyer, F.R.S. 



CONTENTS. 



PAGE 



Past I. Probable Oeigin or Some oe the G-eoups. 



j I. Nebulae 2 



Globular nebulae 4 



Globular nebulae showing condensation 6 



Effects of subsequent rotation 7 



Cometic nebulae 9 



II. Stars with bright lines or flutings 10 



Reference to the old view 10 



The question of hydrogen 12 



The cometic nature of stars with bright lines 13 



III. Stars with bright flutings accompanied by dark flutings 15 



IV. Stars in which absorption phenomena predominate 15 



Paet II. Classification into Geoups. 



I. Former classification of stars 16 



Fraunhofer, Rutherfurd, and Secchi 16 



Relation to temperature 18 



Vogel's classification 20 



II. Proposed new grouping , , . 23 



Paet III. Sub-Gboups and Species of G-eoup I. 



I. Sub-group. Nebulae 27 



Species of nebulae 28 



II. Sub-group. Bright-line stars 29 



Masking of radiation effects 30 



VOL. XL1V. 13 



