472 Scientific Intelligence. 



For further information, those desiring to avail themselves of 

 the opportunities to be offered in the daily lectures, conferences 

 and demonstrations, etc., should communicate promptly with 

 Professor William E. Ritter, director of the Institution, at La 

 Jolla. 



Obituary. 



Dr. John Wesley Judd, professor of geology at the Royal 

 School of Mines from 1876 to 1905, died on March 3 at the age 

 of seventy-six years. His productive work began in 1867 when 

 he joined the Geological Survey and from this time on his activ- 

 ities extended over a wide field. Early interested in tho new 

 methods of investigating rocks with the microscope through the 

 influence of Dr. H. C. Sorby, bis contributions to the study of 

 igneous rocks and the minerals contained in them were numerous 

 and important. He also studied volcanic phenomena directly by 

 visits to the Lipari Islands, Vesuvius, and elsewhere in Italy, 

 Hungary and other fields ; an excellent volume on " Volcanoes " 

 was published in 1878. Further, his work included the handling 

 of general geological problems ; one important group of papers 

 dealt with the Neocomian, and another with the oolites of the 

 Midlands. Geological students were much aided by his revisions 

 (1866 and 1911) of Lyell's Students' Elements of Geology. 

 Another small but useful work in a different department is his 

 " Coming of Evolution " published in 1911. 



Dr. Harry Clary Jones, since 1904 professor of physical 

 chemistry at Johns Hopkins University, died suddenly at his 

 home in Baltimore, Md., on April 9 at the age of fifty years. He 

 was an active and successful worker in his chosen field and bad 

 published numerous important papers on solutions, their conduc- 

 tivities, viscosities and absorption spectra ; on freezing and boil- 

 ing point methods and allied subjects. He was also the author 

 of several books, one of these an " Introduction to Physical Chem- 

 istry." Further he was associate editor of several scientific 

 journals. 



Professor Eric Gerard of Liege, the electrician and writer 

 on subjects in technical electricity, died in Paris on March 27, in 

 his sixtieth year. 



Dr. E. Heckel, professor of botany in the University of Mar- 

 seilles, died recently at the age of seventy-two years. 



Professor Julius Wilhelm Richard, the distinguished 

 German mathematician, has died recently. 



