I844-54- SCIENTIFIC PAPERS. 1 85 



found in the Appendix. To one of the first, " On a simple 

 mode of constructing Skeleton Models to illustrate the 

 systems of Crystallography," the Royal Scottish Society of 

 Arts awarded a medal of five guineas' value, believing the 

 invention likely to be of much service. Before the same 

 Society a paper was read in 1845, " On the employment of 

 Oxygen as a means of Resuscitation in Asphyxia." In 1848 

 he brought before it "Suggestions on the use of the Electro- 

 Magnetic Bell in conducting Sound ; " and in later years, 

 1853 and 1854, his series of Researches on Colour-Blind- 

 ness, for which the Society conferred on him the highest 

 honour, the Keith prize, value 30; and in addition a 

 grant of money, to be expended on the inquiry, was placed 

 at his disposal. In 1855 the Researches were published, 1 

 with some additions, and form a valuable contribution to 

 previous investigations on this subject. None of his in- 

 quiries attracted so much attention as these, probably from 

 their bearing so widely on the welfare of the public. They 

 are referred to with commendation by Dr. W. C. Henry, in 

 his "Life of Dalton;" 2 by Professor Clerk Maxwell, of 

 Aberdeen ; 3 by Professor Tyndall, of the Royal Institution, 

 London; 4 by W. Pole., Esq., C.E.; 5 and by Dr. J. H. 

 Gladstone. 6 Sir David Brewster, in a recent paper on 

 Colour-Blindness, speaks of the Researches as a " very in- 

 teresting volume." It is thus more fully referred to in an 

 elaborate article, by Sir David Brewster, who discusses its 



1 " Researches on Colour-Blindness, with a supplement on the Danger 

 attending the present System of Railway and Marine Coloured Signals." 

 Sutherland and Knox, Edinburgh. 



2 See Appendix to "Life of Dalton," by Henry. 



3 "Trans. R. S. E." vol. xxi. p. 284. 



4 "London and Edinb. Phil. Mag." vol. xi. p. 329. 



5 " Trans. R. S. for 1859," p. 323. 



6 "Report of Brit. Assoc. for 1860." I 



