Ivi Annual Report of the Council. 



American Association for the advancement of Science. He was 

 elected an honorary member of this society in 1886. 



In 1 89 1 he received the Janssen medal from the French 

 Academy of Science for his Spectroscopic work. 



Several important devices applicable to the spectroscope, are 

 due to Professor Young, notably that for separating the various 

 diffraction spectra. 



He remained at Princeton to 1905, when from failing health, 



he resigned active duties, and was made Professor Emeritus, 



returning to spend his closing years at his old home in Hanover, 



where he died on January 3rd, 1908. 



T. T. 



