Apáthy’s Mounting Medium.—Picked gum arabic, 50 Gm.; cane-sugar, 50 Gm.; distilled water, 50 Gm.; dissolve over a warm bath and add 0·05 Gm. of thymol. This medium sets very hard, and combined with a paper cell it may be used for ringing glycerine mounts.
Cole’s Slow or Exposure Method of Mounting.—Dissolve dried Canada balsam, 3 ozs., in benzole, 3 fl. ozs., and filter. Apply a clean cover-glass to a slide that has been moistened by breathing on it, and place a few drops of the balsam solution on the cover-glass. Then remove a section from turpentine, and put it into the balsam. Put aside for 12 hours to allow the benzole to evaporate, and having warmed a slide and added a drop of fresh balsam solution to that on the cover-glass, bring the fluid balsam in contact with the warmed slide. Press the cover down carefully to avoid the inclusion of air bubbles, and when the excess of balsam is squeezed out, put the slide aside to cool, after which it may be cleaned with a camel-hair brush or soft rag moistened with methylated spirit.
Farrant’s Solution.—Take of gum arabic 5 parts; water 5 parts; when the gum is fairly dissolved add 10 parts of a 5 per cent. solution of carbolic acid.
Flemming’s Glycerine Preservative.—Mix equal parts of alcohol, glycerine, and water. Lee recommends the addition of 0·5 to 0·75 per cent. of acetic acid.
Lee’s Turpentine Colophonium Mounting Medium.—This is highly recommended for general work, and is prepared by adding small pieces of colophonium to rectified oil of turpentine, heating in a stove, and when the solution is sufficiently thick filtering twice in the stove.
Seaman (Glycerine Jelly).—Dissolve isinglass in water so as to make a jelly that remains stiff at the ordinary temperature of the room, and add one-tenth part of glycerine, together with a little solution of borax, carbolic acid, or camphor water. Filter through muslin whilst warm and add a little alcohol.
Seiler (Alcohol Balsam).—Heat Canada balsam until it becomes brittle when cold, then dissolve in warm absolute alcohol and filter through absorbent cotton-wool. This is chiefly useful as a mounting medium for objects stained with carmine.
Squire (Farrant’s Medium).—Dissolve in 200 C.c. of distilled water 1 Gm. of arsenious acid and 130 Gm. of gum arabic, then add 100 C.c. of glycerine. Filter through fine Swedish filter paper upon which has been deposited a thin layer of talc.
Squire (Glycerine and Gum).—Dissolve 130 Gm. of gum arabic in 200 C.c. of chloroform water (1 in 200), then add 100 C.c. of glycerine and filter.
Squire (Glycerine Jelly).—Soak 100 Gm. of French gelatine in chloroform water, drain when soft, and dissolve with heat in 750 Gm. of glycerine. Add 400 Gm. of chloroform water, with which has been incorporated about 50 Gm. of fresh egg albumen, mix thoroughly, and heat to boiling point for about 5 minutes. Make up the total weight to 1550 Gm. with chloroform water and filter in a warm chamber.