448 Scientific Intelligence. 



been before observed, so far as we are aware, and it is a difficult 

 thing to catch, since the fluorescence is much fainter than when a 

 broad spectral region is used to excite. However, there was no 

 question that as the exciting light was changed from the yellow 

 through the red, the fluorescence first gradually disappeared and 

 then suddenly appeared again as the wave-length of the line 

 itself was passed. This is indeed just what would be expected 

 with a line showing selective absorption and therefore due to a 

 normal mode of vibration." " Comparing the fluorite and ruby 

 lines, then, we have one showing no corresponding absorption, no 

 synchronous resonance, no Zeeman and no Stark effects ; this line 

 may not be a normal mode ; the other shows absorption, reson- 

 ance radiation, and Zeeman effect, but no Stark effect, and 

 apparently is a normal mode." 



The " inverse " Stark effect was searched for in vain in the 

 case of the fine absorption lines of monazite, praseodymium sul- 

 phate, neodymium sulphate, neodymium nitrate, and uranyl 

 nitrate. Visual observations alone were made, the crystals being 

 maintained at liquid-air temperature and subjected to gradients 

 from 45,000 to 60,000 volts per cm.— Phil. Mag., xxx, p. 316, 

 August, 1915. h. s. 0". 



Obituary. 



Professor Frederick Ward Putnam, the distinguished 

 anthropologist and naturalist, honorary curator of the Peabody 

 Museum at Harvard University, died on August 14 in his seventy- 

 seventh year. He was a man of untiring energy, effectively 

 exerted not only in ethnological research, but also in museum 

 development and in various lines of administrative work. 



Dr. John Howard Van Amringe, professor of mathematics 

 in Columbia University from 1865 to 1910, and for many years 

 dean of the faculty, died on September 10 at the age of seventy- 

 nine years. During half a century of service, his ability and 

 wisdom as a teacher and dean, and his charming personality, won 

 for him an enviable place in the esteem and affection of thousands 

 of students. 



Dr. Karl Eugen Guthe, professor of physics in the Uni- 

 versity of Michigan and dean of the Graduate School, died on 

 September 11 at the age of forty-nine years. 



Dr. Paul Ehrlich, the distinguished German pathologist, 

 director of the Institute for Experimental Therapeutics at Frank- 

 furt, died on August 20 at the age of sixty-one years. 



Dr. Julius von Payer, the Austrian explorer and artist, who 

 was associated with Lieutenant Weyprecht in the discovery of 

 Franz Joseph Land in 1871, died recently at the age of seventy- 

 three years. 



