472 IN MEMORIAM : WILLIAM ACKROYD. F.I.C, F.C.S. 
Salt Circulation and its Geographical Bearing (Brit. Assoc., 
1901). 
Absorption of Rontgen Rays. 
Radium and its position in Nature (19^^ Century, May, 1903). 
Experiments and Observations with Radium Compounds 
(Brit. Assoc., 1903). 
Colour Changes effected by Radium Rays (Soc. Chem. Ind.). 
On the Origin of Colour {Chem. News, 1893, vol. 67). 
Colours of Iodides (Brit. Assoc., 1903). 
Inverse Relation of Chlorine to Rainfall (Brit. Assoc., 1901). 
Distribution of Chlorine in Yorkshire (Brit. Assoc., 1901). 
Telluric Distribution of the Elements (Brit. Assoc.). 
Various Papers on the Teaching of Chemistry and Research 
Work done by Students under his supervision at the 
Technical School. 
" The Old Light and the New." The Chemistry of Colour 
and the New Photography (1896). 
