182 



Presents. 



[Mar. 17, 



that although, the lines seem to be in the same position their relative 

 intensity has greatly altered. The strongest corona line during the 

 last eclipse had a wave-length of about 4232; it is slightly but 

 distinctly less refrangible than the strong calcium line at 4226. 



The measurement of the photographs is very fatiguing to the eyes ; 

 and it is only when these are in exceptionally good condition that the 

 work can be done with any degree of accuracy. The delay in bring- 

 ing out a full report is solely due to this difficulty. 



The second spectroscope had its slit placed so as to take a radial 

 section of the corona. It had one large prism giving a theoretical 

 resolving power of 11*4 ; slightly larger therefore than the two- 

 prism spectroscope. 



The film was one prepared by Captain Abney so as to be more sen- 

 sitive in the green than the ordinary plates. 



The photograph obtained is faint, but I believe will ultimately give 

 good results. 



A good drawing of the corona was obtained by Captain Maling at 

 the station occupied by Captain Darwin and myself. 



The plates were prepared by Captain Abney, whose valuable help 

 1 have had in the whole of the preliminary arrangements. 



Presents, March 17, 1887. 



Transactions. 



Leipzig : — Konigl. Sachs. Gesellschaft der Wissenschaften. Berichte. 

 (Math.-Phys. Classe.) 1886. Supplement;. 8vo. Leipzig 

 1887. The Society. 



Liege : — Societe Geologique de Belgique. Proces-Verbal de 

 l'Assemblee du 21 Novembre 1886. 8vo. Liege 1887. 



The Society. 



London : — Odontological Society. Transactions. Vol. XIX. 



No. 4. 8vo. London 1887. " The Society. 



Photographic Society. Journal and Transactions. Vol. XL 



No. 5. 8vo. London 1887. List of Members, &c. 8vo. London 



1887. The Society. 



Royal Institute of British Architects. Journal of Proceedings. 



Vol. III. No. 10. 4to. London 1887. The Institute. 



Observations and Reports. 



Bombay : — Brief Sketch of the Meteorology of the Bombay Presi- 

 dency, 1885-86. Polio. [Bombaij] 1887. : 



Meteorological Office, Bombay. 



