This work is intended by the Author to form a practical handbook of reference upon all the chemical substances and processes in use among dyers and calico printers. While written from a practical point of view it tames a middle course between the generalities of high science and the technicalities of pure practice. Avoiding on the one hand the applications of chemical principles which are not yet clearly perceived and on the other a detailed description of processes which would be either unintelligible or unnecessary the author hopes he has produced a book which may be profitably consulted by all who are either interested or practically engaged in printing and dyeing.