XXXV111 



of last year he resumed his labours, completing the survey at twenty - 

 four other stations in Scotland and the adjacent islands. 



Through the winter of 1857-58, Mr. Welsh had suffered from 

 an affection of the lungs ; and on his return from Scotland, in the 

 autumn of 1858, the disease had evidently made rapid progress. 

 Arrangements had been made which would have enabled him to pass 

 the winter in a tropical climate ; but acting under the best medical 

 advice that could be procured in the metropolis, he, accompanied by 

 his mother, proceeded to Falmouth. In that place, by the kindness 

 of Mr. R. W. Fox and his family, Mr. Welsh received every attention 

 which they had it in their power to offer. His only regret during 

 his illness appears to have been his inability to complete the works 

 he had undertaken. He died on the 1 1th of May, 1859, in the 35th 

 year of his age, not less esteemed for his private worth by those who 

 had the pleasure of his acquaintance, than appreciated for his emi- 

 nent abilities and valuable services by men of science, 



PETER GUSTAV LEJEUNE DIRICHLET was born at Diiren, where 

 his father was Commissaire de Poste, on the 13th of February, 1805. 

 After going through the course of instruction followed in the Gym- 

 nasium of Cologne, he went to Paris to continue his studies, and 

 in May 1823 he became tutor in the family of General Foy. Here 

 he formed an acquaintance with the most distinguished mathema- 

 ticians of France. On the recommendation of Fourier, who was 

 the first to appreciate his genius, and aided by Gauss, Von Humboldt 

 procured for him an appointment in Prussia. In November 1827 

 he obtained the position of Teacher in the University of Breslau, 

 and in the year following was nominated Professor Extraordinary'. 

 Being appointed soon after to lecture at the Royal Military School 

 of Berlin, he became Professor Extraordinary in the University of 

 that place. On the 13th of February, 1832, he was elected a Member 

 of the Royal Academy of Sciences of Berlin ; on the (fth of May, 1833, 

 Corresponding Member of the Institute of France; in 1833 Corre- 

 sponding Member of the St. Petersburg Academy ; in 1839 Ordinary 

 Professor of the University of Berlin; in 1846 Member of the 

 Gottingen Academy of Sciences. In 1847 a Professorship in the 

 University of Heidelberg was offered to him. In 1854 he was elected 

 Member of the Academies of Stockholm and Munich, and Foreign 



