Ixx 



on the motion of a fluid homogeneous elhpsoid. These two memoirs were 

 printed in the eighth and ninth volumes of the ' Abhandhmgen ' of the 

 Society. 



Riemann married in 1862. In July of the same year he suffered from 

 an attack of pleurisy. Through the good offices of Professors Weber and 

 V. V/altershausen he obtained leave of absence and pecuniary assistance 

 from a fund available for such purposes, to enable him to travel in Italy. 

 He quitted Gottingen in November and passed the winter in Messina. His 

 health in some degree restored, he left Messina in March 18G3, on his 

 homeward journey, stopping in Palermo, Naples, Rome, Pisa, Florence, and 

 Milan, and making the acquaintance of the most distinguished men of 

 science of Italy. He arrived in Gottingen in July, suffering from a re- 

 lapse caused by exposure to cold in crossing the Spliigen. In the following 

 August he entered upon his second journey to Italy. The Professorship 

 at Pisa, vacant by the death of Mosotti, was offered to him at the sugges- 

 tion of Professor Betti, but declined by the advice of Riemann' s friends on 

 account of the state of his health. He passed two successive winters in 

 Pisa, In the autumn of 1865 he returned to Gottingen, and began to 

 write a paper on the mechanism of the ear, which was published after his 

 death by Professors Henle and Schering. He entrusted the completion 

 of a paper on the surface of least area, having a given boundary, to Dr. 

 Hattendorff. This paper is printed in vol. xiii. of the ' Abhandlungen ' of 

 the Society of Gottingen. Desirous of passing some months on the shores 

 of the Lago Maggiore in order to collect strength sufficient to enable him 

 to complete his unfinished works, he left Gottingen on the 16th of June 

 1866, and after some delay, caused by the events of the war, reached 

 Lago Maggiore on the 23rd of the same month. 



Perfectly conscious of his approaching end, and fully prepared for it, he 

 repeatedly urged his physician to tell him how long he had to live, in order 

 that he might thereby be guided in the selection of a labour that it might 

 be possible for him to complete. He died in entire possession of his 

 faculties on the 20th of July 1866, at Selasca, near Intra, on the Lago 

 Maggiore, having only the day before worked on the mechanism of the 

 organs of hearing, whilst he warned his attendants that his death was at 

 hand. 



He is gratefully remembered by his pupils for his hberality in imparting 

 t3 them the results of known, new and important unpubhshed researches, 

 a id for the unwearied zeal with which he strove to impress upon them the 

 whole truth of his lessons. 



The materials for the preceding sketch of Professor Riemann's life were 

 obtained from a * Gedachtniss-Rede,' addressed to the Royal Society of 

 Gottingen by Professor Schering, and some manuscript notes supplied by 

 Professor Clebsch. 



