161 Scientific Intelligence. 



member of the National Academy of Sciences, and was connected 

 with many other scientific societies, among which may be men- 

 tioned the American Philosophical Society, the American Academy 

 of Arts and Sciences, the New York Academy of Sciences, the 

 American Metrological Society. He was also a corresponding 

 member of the British Association for the Advancement of 

 Science, and a Fellow of the American Association of the same 

 name. 



Professor Mayer's scientific work was marked by strongly 

 characteristic traits. He possessed great ingenuity and skill in 

 construction, and a remarkable degree of delicacy and precision 

 as an experimenter, which enabled him to obtain results that will 

 have a high and permanent value in science. Beyond his scien- 

 tific accomplishments he was a man of wide and refined culture, 

 with a genial presence, and social qualities which made him a 

 delightful companion and endeared him to his friends. He leaves 

 a wife and one son. a. w. w. 



Pkofessok A. Des Cloizeaux, the eminent French Mineralo- 

 gist, died at Paris on the 6th of May, at the age of seventy-nine 

 years. His contributions to Mineralogy, especially on the crystal- 

 lographic and optical side, were very numerous and all of the 

 highest character. The development of the methods for the 

 study of the optical characters of crystals is largely due to him, 

 and his three classical memoirs devoted to this subject and giving 

 the results of the optical examination of a very large number of 

 minerals and artificial salts, will always hold the first place in the 

 literature; they were published in 1857, 1858 and 1864. The 

 Manuel de Mineralogie is also a profound work containing the 

 results of his own original observations. The first volume of 572 

 pages, devoted to the Silicates, was published in 1862 ; two por- 

 tions of the second volume were issued much later, namely in 1874 

 and 1894 respectively. Professor Des Cloizeaux was a man of 

 noble character and of charming personality ; he was honored 

 not only by those who had the privilege of his acquaintance but 

 by the much larger number who knew him only through his 

 scientific work. 



Julius Sachs, Professor of Botany at Wtirzburg, died on May 

 29, in his sixty-fifth year. 



Notice. — The Director of the Imperial Museum of Natural 

 History has the honour of notifying that Mr. Aristides Brezina 

 has ceased to be the chief of the mineralogical and petrographical 

 section and that all letters, specimens and other consignments, 

 especially those concerning meteorites, are to be addressed in 

 future to the mineralogical and petrographical section of the 

 Museum or to the chief of the same, at present Professor Fritz 

 JBerwerth, Vienna I Burgring 7. 



