Of every description, made in the usual way, but with the addition of about 1 drachm of salicylic acid to every 4 pounds of the preserve, will keep sound with absolute certainty for a much longer time, fermentation and mouldiness being prevented. Under exceptionally unfavorable circumstances, such as hot pantries, a little of the dry acid should be sprinkled on the top of the vessel or preserve pot. A tightly-fitting piece of blotting paper, previously saturated with a concentrated solution of salicylic acid in spirit, brandy, or rum, and placed on the top of the preserves will also greatly aid in keeping them.
NEW-LAID EGGS
Can be kept for a very long time by being placed for half an hour in a cold, saturated, aqueous solution of the acid, then allowed to dry in the air, and, as usual, kept in a cool place. Some prefer to coat them by dipping them in melted paraffine after they have been treated in this manner. (Use no straw or hay in packing eggs.)
THE YOLK AND THE WHITE OF EGGS
Are most effectually preserved for a long time by the addition of 1/2 to 1 ounce of the acid per 20 pounds of these substances. It is also well to place a paper soaked in the salicylic acid solution on the top of them, which greatly enhances the preserving effect.
In the manufacture of vinegar, salicylic acid is also of great importance to prevent false or excessive fermentation, putridity, etc.
WINE.
With respect to wine the experiments of Prof. Neubauer of Wiesbaden have proved that the introduction of the acid for the preservation of wine marks an era of great industrial progress, as it energetically prevents, even when used in very small quantities, the formation of mould germs and other circumstances which are injurious to wine, while it absolutely arrests secondary fermentation, cloudiness, etc. As wine differs very much in its constitution the requisite quantity of salicylic acid must be found out by practice in each particular case. About 1/4 to 3/4 of an ounce per 50 gallons will be found sufficient for most wines. In using the salicylic acid for this purpose it is recommended to make a strong solution of it in pure spirit, perfectly free from fusel oil, and then to add of this solution as much as may be requisite.
If in addition to this the casks are washed out with an aqueous solution of the acid it will prove of great service, and all other agents at present used for this purpose will soon be abandoned. The larger the amount of sugar in proportion to the alcohol the more salicylic acid will be required. The addition is best made when the wine has attained its full ripeness. The effervescence of wine in spring, or after carriage in warm weather, will at once be stopped. The salicylic acid kills all kinds of germs, and destroys the growth and action of any yeast which may still be present; it is therefore of incalculable value in effectually preserving wine, and as a preventive of the deterioration to which this liquid is subject.