Chemistry and Physics. 413 
dependent not on the actual quantity of colored material, but on the rel- 
ative proportion of the solvent. Diagrams of the changing appearances 
of sulphocyanid of iron, of chlorid of copper, and of chlorid of cobalt 
were exhibited. 
the circumstances attending Palmer’s trial induced him to make a series 
of experiments on the subject, and he tried the effects of a precipitant 
arts 
