Anniversary Meeting, 



[Nov. 30, 



follow the moon in right ascension, and thus of course a much greater 

 approach to perfection was attainable. 



In the department of solar photography, Mr. De la Eue stands 

 almost alone. Assisted by the suggestions of the late Mr. John Welsh, 

 he devised the Kew photoheliograph, which is now regarded as a model 

 instrument for taking instantaneous sun-pictures. This instrument was 

 taken to Spain by Mr. De la Eue in 1860 in order to observe the 

 total solar eclipse, and the undertaking was perfectly successful. 

 Numerous photographs w^ere taken during the partial phase, and two 

 during the totality, that showed the forms and positions of the red 

 protuberances much more perfectly than had ever been done before. 

 The experience gained respecting the photographic energy of the light 

 of the prominences is also very valuable ; for it is shown that a much 

 shorter time of exposure than Mr. De la Eue ventured upon would 

 have been sufficient to obtain good pictures, so that it may be expected 

 that in future eclipses astronomers will be able to get ^ greater number 

 of photographs during the totality, while the photographs themselves 

 will be sharper and better defined. The photographs obtained in the 

 solar eclipse of 1860 have been discussed by Mr. De la Eue in a most 

 elaborate paper in the Philosophical Transactions for 1862, forming 

 the Bakerian Lecture. In this memoir, and in his reports on the pro- 

 gress of Celestial Photography in the volumes of the British Associa- 

 tion for 1859 and 1861, Mr. De la Eue has fully described his processes 

 and instruments, and has thus deepened the feelings of obligation to 

 him, by giving others the benefit of his long experience in the art, 

 though even with this guidance no one can hope to attain to great 

 proficiency in its practice without time, patience, and perseverance. 



Mr. De la Eue, 



I have the gratification of presenting you with this Medal, which the 

 Council has awarded to you for your most valuable labours in the appli- 

 cation of Photography to Astronomy. 



You, Sir, are in the enjoyment of the fullest health and strength, and 

 may, we hope, look forward to many years of active and useful occupa- 

 tion in departments which you may be said to have created for yourself 



You may be well assured. Sir, that the sympathy and interest of the 

 Eoyal Society will continue to attend you in this work, while it will 

 count on many valuable contributions from you to its Transactions in 

 future years. 



The Council has awarded a Eoyal Medal to Jacob Lockhart Clarke, 

 Esq., P.E.S., for his researches on the intimate structure of the Spinal 

 Cord and Brain, and on the development of the Spinal Cord, pubKshed in 

 five memoirs in the Philosophical Transactions, and in other writings. 



On the occasion of conferring on one of our Pellows a well-earned 



