6365. Ink for Writing on Tin Plates

6365.    Ink for Writing on Tin Plates. Mix together without heat, 1 part pine soot, with 60 parts of an aqueous solution of nitrate of copper. (Hager.)

6366. Black Stencil Ink

6366.    Black Stencil Ink. Triturate together 1 part pine soot and 2 parts Prussian blue with a little glycerine, then add 3 parts gum arabic, and sufficient glycerine to form a thin paste.

6367. Factitious Beef Marrow

6367.    Factitious Beef Marrow. Mix together, by dissolving at a gentle heat, 2 parts fresh hogs' lard and 1 part cacao butter.

6368. To Obtain Absolute Alcohol

6368.    To Obtain Absolute Alcohol. A German savant has recently improved on the well-known method employed by Men-delejeff, for obtaining absolute alcohol. Strong alcohol is boiled with quicklime, the pieces of the latter projecting above the surface of the liquid for 1/2 hour or more, with a condenser inverted so that the liquid may return by its own gravity to the flask. The condenser is then reversed, and the alcohol redistilled. If the alcohol contains more than 5 per cent, of water, the process must be repeated 2 or 3 times. The vessel should only be half filled with the pieces of lime, as the rapid formation of hydrate of lime may break it to pieces. (See No. 1442 (Chemical Method of Procuring Absolute Alcohol).)

6369. Bougie

6369.    Bougie. A long slender instrument, introduced into the urethra, oesophagus, or rectum, to overcome strictures of those canals. Add 3 parts boiled linseed oil to 1 part melted amber, and when mixed add 1 part oil of turpentine ; spread the mixture at 3 successive intervals upon loose spun silk cord or web, dry in a heat of 150° Fahr., and repeat the process until the instrument has acquired the proper size, then polish, first with pumice-stone, and afterwards with tripo-li and oil. This is the original receipt of the French Professor Pickel, and is still generally used in Europe, slightly modified as follows : Add to the oil and amber, melted together as last, caoutchouc in the proportion of 1/20 of the weight of the oil employed;

when dissolved, remove the vessel from the fire and proceed as before.

6370. Hunter's Bougie

6370.     Hunter's Bougie. Boil slowly together, until combination takes place, 2 parts yellow wax, 3 parts red lead, and 6 parts olive oil; strips of soft linen, rather wider at one end than the other, are then dipped into the composition, rolled up firmly, and finished on a polished slab.

6371. Catheters, or Hollow Bougies

6371.    Catheters, or Hollow Bougies. These are made of the same composition as the ordinary bougies, but a piece of polished metallic wire is introduced into the axis of the silk; or tinfoil is rolled round the wire and the composition applied as before.

6372. Caoutchouc, or Elastic Gum Bougies

6372.    Caoutchouc, or Elastic Gum Bougies. These are made by applying an ethereal solution of india-rubber to the silk or foil prepared as in the foregoing methods. "Where ether is expensive naphtha is employed, but it furnishes a very inferior product. Sometimes slips of india-rubber previously boiled in water, or that have had their edges softened with ether, are wound round the wire or foil, and kept in their place by a piece of tape applied over them, as in making elastic tubes. They are afterwards carefully smoothed off and polished.