APPENDIX 477 



The subject of this notice was about 1861 appointed Professor 

 of Chemistry in the Technological Institute at St. Petersburg 

 (Petrograd). In 1866 he became Professor of General Chemistry in 

 the University, the Chair of Organic Chemistry being occupied at 

 the same time by Butlerow. 



In 1890, in consequence of a difference with the authorities, he 

 retired from his professorship. In 1893, however, he was appointed 

 by M. Witte to the office of Director of the Bureau of Weights and 

 Measures, which he retained till his death. This occurred on 20th 

 January (O.S.), 1907, within a few days of his seventy-third birth- 

 day. 



Mendeleeff's name is indissolubly connected with the evolution 

 and final establishment of the principle of periodicity among the 

 elements, the first recognition of which we owe to John A. R. 

 Newlands, an English chemist. Mendeleeff's table of the elements 

 was first drawn up in 1869, and in 1871 was modified so as to give 

 it nearly the form in which it is to be found in every modern text- 

 book of chemistry. 



The German Professor Lothar Meyer, assisted toward the general 

 acceptance of the principle by the publication in 1869 of his graphic 

 demonstration of the relation between atomic weights and atomic 

 volumes. 



Mendeleeff alone was the first to foretell the properties of these 

 undiscovered elements and to alter atomic weights in confidence in 

 the validity of the law. 



The famous manual entitled Principles of Chemistry, which bears 

 Mendeleeff's name and of which several English editions have 

 appeared, was essentially an exposition of the periodic scheme. It 

 had many original features and will always be a landmark in the 

 history of chemistry. 



Mendeleeff's experimental researches related to the constitution 

 of solutions, and the physical properties of gases. Another subject 

 to which he gave great attention and on which he was con- 

 sulted by the Russian Government, was the nature and origin 

 of petroleum. 



In 1882 the Royal Society conferred on Mendeleeff, jointly with 

 Lothar Meyer, the Davy Medal. In 1883 the Chemical Society 

 elected him an Honorary Member, and in 1889 it conferred on him 

 the highest honour in its power to bestow, namely, the Faraday 

 Lectureship, with which is associated the Faraday Medal. In 1890 

 he was elected a Foreign Member of the Royal Society which, in 

 1905, awarded him the Copley Medal. So far as England is concerned 

 his services to science received full acknowledgment. It is all the 

 more remarkable, therefore, that he never became a member of the 

 Imperial Academy of Sciences in his own country. 



