Free them as far as possible from sand and other foreign matters. Then wash them thoroughly with water, and press them. Next introduce them into a solution of permanganate of potassium containing one ounce of the salt in a gallon; leave them in this liquid two or three minutes; then take them out, express the liquid (which can be several times used over again), wash them with water until no more violet-tinted liquid runs from them, and then immerse them in a solution of one part of hyposulphite of sodium in twenty parts of water, to which immediately before dipping the sponges one part of hydrochloric acid has been added. When the sponge’s are white, remove them and wash them thoroughly with water. After prolonged use, bath sponges lose their elasticity and softness. These properties can be restored by dipping the sponges into a mixture of one part by measure of glycerin and eight parts of water, pressing out the excess of the liquid and allowing them to dry. The small quantity of glycerin which they contain prevents their hardening. INDEX. À la mode perfume, 186 Absorption, 101 Acacia farnesiana, 26 Acetic ether, 80 Acid, acetic, 76 benzoic, 74 carbonic, apparatus, 112 carbonic, for absorption of odors, 102 perfumes, 202 pyrogallic, 84 salicylic, preservation of fats by, 79 Acorus Calamus, 50 Adulteration of essential oils with alcohol, 144 of essential oils with fixed oils, 144 of essential oils with other essential oils, 143 of essential oils with paraffin, spermaceti, or wax, 145 Adulterations of essential oils and their recognition, 139 Alcohol, 63 absolute, manufacture of, 68 amyl, 71 percentage tables of, 70 source of, influence on perfumes, 72 Alcoholometer, Tralles’, 69 Alkanet, 299 Alloxan, 73, 274 Allspice, 21 Allspice, essence of, 159 Almond and honey paste, 234 balls, 244 cold-cream, 243 cream, 230 meal, 234 paste, simple, 233 Almonds, bitter, 24 sweet, 50 Aloysia citriodora, 54 Amandes amères, 24 Amandes douces, 50 Amandine, 230 Ambergris, 57 tincture of, 151 Ambra grisea, 57 Ammonia, 73 carbonate of, 74 Ammoniacal perfumes, 199 Amygdala amara, 24 dulcis, 50 Amyl alcohol, 71 Ananas, 44 Ancients, perfumery among the, 2 Andropogon citratus, 30, 35 laniger, 30 muricatus, 30, 54 Nardus, 29 Schoenanthus, 30 Aneth, 31 Anethum graveolens, 31 Animal substances used in perfumery, 57 Anise, 21 Anti-Odorin, 278 Apple ether, 81 Aromatic substances, division of, according to their origin, 8 substances in general, 6 substances, relative strength of, 7 substances, special characteristics of, 118 substances, vegetable, chemical constitution of, 15 substances, vegetable, employed in perfumery, 20 vinegar, 203 waters, 113, 167 Aspic, 35 Attar of rose, 133 Auricome, 291 Badiane, 48