The following are instructions on dyeing ostrich feathers black. First soften the feathers by soaking them in a warm bath consisting of lib. of carbonate of soda in 10gal. of water, then rinse in clean water; they are then dyed by soaking them in a bath containing 1 lb. of ferric chloride or nitrate in 1 gal. of water. After again washing, boil them till black in a bath previously made by boiling 2 lb. of logwood and 2 lb. of quercitron bark with 1 gal. of waterand straining. It a blue black is required, use2oz. of sulphate of copper with the ferric salt. Alter again dyeing, wash the feathers in clean water, dip in an emulsion made by shaking a solution of carbonate of potash with olive oil, and shake them in the air of a warm room till dried. It will be advisable first to experiment on worthless samples of feathers.