54 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 1 894, 



Esthonia, where he spent the remainder of his life, nmch respected 

 by all. On December 27th, 1887, the Geological Committee of the 

 Institute of Mines at St. Petersburg, with many other societies 

 and friends, celebrated the jubilee of his scientific work. On this 

 occasion a congratulatory letter was sent to him from the Council 

 of this Society. 



Von Keyserling died at Raykiill on the 8th May, 1891, in the 

 76th year of his age. For some reason this obituary notice has 

 been delayed. 



Prof. Juan Vilanova y Pieea, Foreign Correspondent, was born 

 at Valencia in 1822. He was originally brought up to the medical 

 profession, obtaining his degree of licenciate in 1845, but hardly ever 

 practised, as in early life he devoted himself to geological pursuits. 

 About the year 1853 the Spanish Government gave him a com- 

 mission to study geology in different European countries, and he 

 travelled accordingly for a considerable number of years. On his 

 return to Spain he was promoted to the Chair of Geology in the 

 Natural History Museum at Madrid, a post which he held till 1873, 

 when he became the first occupant of the new Chair of Palaeontology. 

 About this period he also brought out a text-book of geology, for a 

 long time the only one in the Spanish language. 



As a member of the national Survey he studied the geology of 

 the provinces of Teruel, Castellon, and Valencia, and published 

 geological maps and memoirs relating to them. Of late years he 

 was much interested in prehistoric subjects, and besides his publi- 

 cations he endeavoured to popularize this branch of study by 

 frequent lectures in Madrid and the provinces. Agriculture also, in 

 its relations to geological science, was one of his favourite themes. 



Vilanova died at Madrid on the 7th June, 1893, having just 

 completed his 71st year. 



Karl August Lossen, Foreign Correspondent, Professor of Petro- 

 graphy and Geology in the University and Mining Academy, Berlin, 

 was born on the 5th January, 1841, at Kreuznach, in Rhenish 

 Prussia, where his father was in the medical profession. After 

 leaving school young Lossen chose mining — a career which he after- 

 wards gave up in order to turn his attention to geology and more 

 especially petrography. In 1869, he took his degree in the philo- 

 sophical faculty of the University of Halle with his thesis ' Be Tauni 

 montis parte transrhenand,' having also obtained much geological 

 experience under Beyrich in the Harz. In 1872, on his admission 

 to the Prussian Geological Survey, he was commissioned by the 



