Experience having shown that all alcoholic perfumes develop their proper aroma only after storing for some time, provision must be made to have always a sufficient supply of Cologne water on hand. It is best to keep it in large glass balloons in a cool cellar. Wooden vessels are impracticable on account of their permeability and other evils. Metallic vessels, if used, should be tinned. Vessels defective in this respect, or tinned with tin containing lead, exert an injurious effect upon the aroma of the water. In the latter case, lead is dissolved, even if only in small quantities, and a dirty precipitate injurious to the odor of the Cologne water is formed. The filtering of the Cologne water is best effected through white filtering paper and a glass funnel; the paper, however, should not have been bleached with chlorine, the odor of the latter being readily perceived and having an injurious effect upon the aroma of the water. Filtering should be avoided as much as possible by carefully decanting off the clear water and filtering the sediment only. Filtering through charcoal, magnesia, or other clarifying agents, should not be made use of for fine perfumes, their odor being injured by all such means. In the following a selection of receipts for Cologne water is given; it is, however, especially mentioned that only good, pure materials must be used even for the inferior qualities. A receipt for the now fashionable "Maiglöckchen Eau de Cologne" is also given. _Cologne water, quality I._--Bring into a large glass balloon 95 to 96 per cent. alcohol of the best quality 7.9 gallons, lemon oil 14.11 ozs., bergamot oil 15, neroli oil 4.23, French extra lavender oil 1.05 oz., rosemary oil 0.7, best German balm oil 0.42; mix thoroughly, and after 14 days add best orange-blossom water and rose water each 2.64 quarts. Mix again thoroughly, and then let stand until wanted for use. _Cologne water, quality II._--Bring into a large glass balloon 95 to 96 per cent. alcohol of the best quality 7.9 gallons, lemon oil 10.58 ozs., bergamot oil 12.34, neroli oil 1.76, French extra lavender oil 0.8, rosemary oil 0.63, finest German balm oil 0.35, French petit-grain oil 0.8; mix thoroughly, and after 14 days add best orange-blossom water and rose water each 2.64 quarts. Mix again thoroughly, and then let stand until wanted for use. _Cologne water, quality III._--Bring into a large glass balloon 95 to 96 per cent. alcohol of the best quality 7.9 gallons, lemon oil 7.05 ozs., bergamot oil 7.94, Portugal oil 3.52, French petit-grain oil 1.58, finest rosemary oil 0.52, lavender oil 0.7, orange-blossom water and rose water each 1.58 quarts, distilled water 2.11 quarts. Proceed in the same manner as given for qualities I and II.