Annual Report of the Council. xxxvii 



health, which had shown signs of faiUng in 1895, began again to 

 trouble him in 1898, and he had made arrangements for retiring 

 when death overtook him. 



His scientific work was carried out mainly in the field of 

 Magnetism and Electricity, in which he made the subject of the 

 the magnetisation of bodies his particular study. He made one 

 of the earliest determinations of the Ohm, made observations on 

 the electromagnetic solution of the plane of polarisation of light 

 just discovered by Faraday, and was the first to call attention to 

 the relation between the conductivities of the metals for heat 

 and for electricity. The great work of his scientific life was, 

 however, the publication in 1861 of his " Lehre vom Galvanismus 

 und Elekfromagnetismus,^' since called '^ Die Lehre von der 

 Elektricitdt^^ and the incorporation in its successive editions of 

 the results of further research, The fourth edition, which he 

 was able to complete before his death, will remain for years a 

 monument to his industry and critical powers. 



Wiedemann was one of the oldest members of the Berlin 

 Physical Society, and was from 1877 to his death the editor of 

 the Annalen der Physik. He joined to a rapid comprehension 

 of a subject the power of giving a clear exposition of it, was most 

 courteous in debate, and a good correspondent. He was 

 present at the British Association meeting in Manchester in 

 1887, taking a prominent part in the work of the Mathematical 

 and Physical Section. 



Further particulars of his work can be found in the VerJiandl. 

 der Deutsch. Pliys. GeselL, 30th June, 1899. 



C. H. L. 



Henry Mere Ormerod, who died on the 26th June, 1898, 

 in the 83rd year of his age, had been in continuous membership 

 with the Society for the long period of fifty-five years, the date 

 of his election being 30th April, 1844. He belonged to an old 

 north-country family which has produced a long line of scholars, 

 theologians, historians, and naturalists, who have left their mark 

 upon the literature of this and neighbouring counties. His 



