DEANE’S COMPOUND.--This is usually deemed about the best medium for preserving Algæ, mosses, &c., and is thus prepared:--Soak 1 oz. of best gelatine in 4 oz. of water until the gelatine becomes soft, when 5 oz. of honey heated to boiling-point are added; boil the mixture, and when it has cooled, but not enough to become stiff, add ½ oz. rectified spirit with which 5 or 6 drops of creosote have been well mixed, and filter the whole through fine flannel. This compound when cold forms a stiff jelly, the use of which will be described elsewhere. GLYCERINE JELLY.--This mixture closely resembles the above, but as the composition differs a little it may be mentioned here. It is strongly recommended by Mr. Lawrance in the _Microscopic Journal_, where he states “that the beautiful green of some mosses mounted two years ago, is still as fresh as the day they were gathered;” and that this is the only medium he knows which will preserve the natural colour of vegetable substances. He takes a quantity of Nelson’s gelatine, soaks it for two or three hours in cold water, pours off the superfluous water, and heats the soaked gelatine until melted. To each fluid ounce of the gelatine, _whilst it is fluid but cool_, he adds a fluid drachm of the white of an egg. He then boils this until the albumen coagulates and the gelatine is quite clear, when it is to be filtered through fine flannel, and to each ounce of the clarified solution add 6 drachms of a mixture composed one part of glycerine to two parts of camphor-water. GOADBY’S FLUID.--This is much used in the preservation of animal objects; and seldom, if ever, acts upon the colours. It is thus prepared--Bay salt, 4 oz.; alum, 2 oz.; corrosive-sublimate, 4 grains. Dissolve these in two quarts of boiling water and filter. For delicate preparations some recommend that this mixture be reduced by the addition of an equal quantity of water; but where there is bone or shell in the object the above acts injuriously upon it, in which case this fluid may be used:--Bay-salt 8 oz., corrosive sublimate 2 grains, water 1 quart. THWAITES’ LIQUID.--This is recommended for the preservation of Algæ, &c., as having little or no action on the colour, and is thus prepared:--Take one part of rectified spirit, add drops of creosote enough to saturate it; to this add sixteen parts of distilled water and a little prepared chalk, and filter. When filtered, mix with an equal quantity of camphor-water (as before mentioned), and strain through fine muslin before using.