The same author prepares this paraffin of 110° F. melting point by mixing sufficient petroleum jelly (evidently white vaselin) with the commercial paraffin melting at about 120° F. to bring the melting point down to 110° F. He claims that making such a mixture is a difficult matter, since a plate of paraffin will have various melting points, one corner melting at 120° and the opposite as high as 140° F. He advises having the mixture accurately prepared in large quantities and dispensing it in test tubes of one-half ounce capacity, as now found on the market. The mixture is poured in hot liquid form into these test tubes, which are then sealed with wax and placed on a sand bath, whose temperature is raised to 300° F. to insure sterilization.

The latter author has devised a neat paraffin heater, shown in [Fig. 287].

Fig. 287.—Smith Paraffin Heater.

Of this he says: “To insure still further the sterilization of the paraffin, I have devised a tin (nickle-plated) receptacle supported on an attached tripod, which raises the bottom an inch from any plane surface on which it is placed, and is closed with a detachable lid. This arrangement prevents the paraffin from burning or browning. Into this I pour the paraffin from the test tube, after melting, and place this receptacle into a sterilizer, or any ordinary boiler—surround it almost entirely with water and then boil. After I have boiled it for a few minutes I remove the receptacle and permit it to cool until the paraffin therein is about 120° F. I then draw it up into the syringe, which has been sterilized in the same boiler with the paraffin. When sufficient is withdrawn, I evacuate the air bubbles from the syringe by pressing the piston upward and run my set screw into place. Some two or three minutes are now allowed for the paraffin to assume equal consistency throughout and to cool down to a semisolid state. When the paraffin reaches this consistency it may be kept many hours ready for use, at the temperature of the room, if only the precaution to warm the needle is taken each time before attempting the injection.”

17. Hypersensitiveness of the Skin.—A permanent hypersensitiveness of the skin over the site of a subcutaneous paraffin injection has never been definitely shown. While it is true there is some pain and feeling of stress and fullness over and about such area, immediately after the operation, this has subsided in about twenty-four hours in the average case, except in those where a very hot liquid paraffin and of large amount has been injected, when several days are required to overcome these symptoms.

Smith claims a numbness over the site of the injected area which soon passes away, but this is perhaps more a feeling of fullness rather than one of anesthesia.

The author has observed, however, in several cases a period of extreme discomfort, fullness and cephalalgia in cases of subcutaneous injections about the root of the nose. Peculiarly these attacks appear only after the filling has become organized; that is, after the connective tissue has displaced the paraffin. The secondary tumor in such cases appears to be slightly larger superiorly than the original size at the time of injection.

The irregularity of these attacks, with edema of the forehead and slight puffing of the upper eyelids, points to a disturbance of the circulation and is undoubtedly due to pressure on the angular vessels, and the venous arch across the root of the nose. The symptoms usually appear in the early morning and moderate toward night, reappearing again the next morning or not again until the next attack, which may be expected at any time.

This condition of affairs is an unfortunate one, since we cannot look to the avoidance of the trouble nor foresee it at the time of operation. In one case the symptoms did not develop until nearly two years after the injection was made and became so troublesome that the only relief had was by opening the skin of the nose laterally and excising as much as seemed necessary of the newly formed connective tissue with a fine pair of curved scissors. None of the injected matter was discovered except two fine scalelike disks of glistening paraffin of a diameter of one sixteenth inch. These were evidently all that remained of the injected mass, and were undoubtedly held in the innermost meshes of the new tissue. Immediate relief followed the operation, but no appreciable difference in the size of the tumor could be noticed.