3] % Anniversary Meeting. [Nov. 30, 



EUMFOKD MEDAL. 

 Nils C. Duner, Director of the Observatory of Lund. 



Dr. Duner has been continuously at work, since 1871, at astro- 

 nomical observations (see ' R.S. Catalogue'). 



He began to turn his attention to spectroscopic subjects in 1878, 

 and commenced the publication of his systematic work on Stellar 

 Spectra in 1882. 



In 1884 he brought to a conclusion his wonderful observations of 

 stars of Yogel's III Class. His memoir contains a detailed study of 

 the spectra of nearly 400 stars, all which are the most difficult objects 

 to observe. This volume is one of the foundations on which any 

 future work in this direction must be based. 



In 1891 he published another series of researches on the rotation 

 of the sun, comparing true solar with telluric lines for regions up to 

 75 of solar latitude. The result showed a diminution of angular 

 velocity with increasing latitude, thus spectroscopically confirming 

 Carrington's results. 



KOYAL MEDAL. 



Professor Charles Pritchard, D.D., F.R.S., Director of the Oxford 

 University Observatory. 



Professor Pritehard began his publications on astronomical subjects 

 in 1852. His first paper and several others which have followed, 

 have dealt with the construction of object glasses and telescope 

 adjustments. 



He was President of the Royal Astronomical Society in the years 

 1867 and 1868. 



He was appointed first Director of the newly-founded observatory 

 at Oxford in 1874. It is now the most active University observatory 

 in the kingdom, as many as fifteen students receiving instruction in ob- 

 servatory work at times. The services he has rendered to astronomy 

 in devising, and keeping at a high standard, the work of the ob- 

 servatory in many directions, including its use as a school, are very 

 noteworthy. 



Immediately on the establishment of the observatory he saw the 

 beneficial effects of photographic investigation, and first applied the 

 method, with the old wet-plate photography, to the problem of the 

 physical libration of the moon. He saw that this problem was 

 encumbered in heliometric work by the fact that a set of the ob- 

 servations must take a considerable time, and therefore they were 

 made on a constantly changing disc, necessitating great labour in 

 reduction. By the observations being made in two or three seconds, 

 the picture of the moon did not alter in the time. The result was to 



