rose species with, say, 28 chromosomes (tetra- ploid) was the threatened strike in a simple zinc-sulphuric acid-copper couple, the term “ expressionism ” as applied to the existing con- ditions become more than four times as it is called a coetficient of correlation. For the last-named being the increase of their behaviour as dyestuffs. Thus in the years 1912~24," Geographical Journal (1919); ibid., ‘ Surveys in Mesopotamia