354 ADDRESS ON PRESENTING GOLD MEDAL TO PROF. H. D' ARREST. [45 



It is worth mentioning that one of the most remarkable of these gaseous 

 nebulae, viz. the planetary nebula numbered 4373 in Sir John Herschel's 

 General Catalogue was observed as a fixed star by Lalande in 1790, and 

 that by comparing its place so determined with the very accurate modern 

 determinations of Schonfeld, D' Arrest, and others, it has been shewn that 

 the proper motion of this nebula is quite insensible. 



I trust that the statement, however bald and imperfect, which I have 

 just laid before you respecting the labours of Professor D'Arrest, will have 

 convinced you that your Council have been fully justified in awarding to him 

 the Society's medal. 



(TJie President then, delivering the Medal to the Foreign Secretary, addressed 



him in the following terms): 



Mr Huggins In transmitting this medal to Professor D'Arrest, you will 

 express to him the admiration we feel for the skill and perseverance which 

 he has shewn in his observations of the nebulae, and our high appreciation 

 of the value of his labours. You may assure him of our ardent wishes that 

 health and strength may long be spared to him, so that he may be able to 

 make many further contributions to the progress of Astronomy. 





