heat increases considerably. After some days, these impetuous motions subside; the fermentation ceases by degrees; the liquor clears up; then it emits a vinous smell and taste. As soon as it ferments no more, it must be distilled. However, some distillers have asserted that a greater quantity of spirit is obtained when the liquor has acquired a certain degree of acidity. Others are of opinion that it must be distilled as soon as it is calm. I am of this opinion, because the acid can only be formed at the expense of a little of the spirit, which is one of the principles of the acetous acid. Besides, the longer the liquor remains in a mass, the more spirit is wasted by evaporation.

CHAPTER IV.

OF THE PROPORTIONS OF THE ELEMENTS NECESSARY TO FORM A GOOD VINOUS LIQUOR.

What are the proportions of the elements necessary to form a good vinous liquor?

We owe the important knowledge of those proportions to the celebrated and unfortunate Lavoisier, who has proved, by the most accurate experiments, that there must be

510 parts in the whole, which produce 57 parts of dry alcohol; that is, containing no more water than is necessary to its formation, and consequently as strong as it can be. Let us dwell for a moment upon the proportions just pointed out, and especially upon their result, which exceeds any thing that has ever been obtained. Supposing the weight of each of those parts to be one pound, we shall have

The produce will be 57lbs. of dry alcohol.

A vessel containing one ounce of water, filled up with this alcohol, weighs only 16dwts. and 16grs. From this report, it appears that the specific weight of the alcohol is, to the weight of the water, as 20 to 24; that is, that water weighs 1/5 more than alcohol. If the 57lbs. thus obtained were only water, it would only represent 7-1/8* gallons; but being alcohol, it weighs 1/6* less, and consequently gives 7-1/8 gallons more, the sixth of this quantity, (to wit:) 1-1/6* gallons, which, added to 7-1/8*, make 8-7/24 gallons.

But 1 gallon of dry alcohol, extended in 2 gallons of water, gives 3 gallons of liquor at 19°, which is called Holland, or first proof; a produce surpassing all what has been hitherto known to the distillers. I will prove it by an example: 1 gallon of molasses yields only 1 gallon of rum, at 19°, to the rum distiller; still, molasses is a true sirup, composed of 8lbs. of sugar, or sweet matter, more fermentable than sugar. 12½ gallons of molasses, representing 100lbs. of dry sweet matter yield consequently 12½ galls. of rum, Holland proof, which is only half the produce obtained by Lavoisier; an immense difference capable of exciting the emulation of all distillers, as it proves the imperfection of the art.

What are the causes of such a dissimilarity of product? We must seek for them.

1st. In the difference of the strength of the vinous liquor. Lavoisier employed only 4 parts of water to 1 part of dry sugar. The rum distiller usually puts 10 gallons of molasses to 90 gallons of water, or the residue of the preceding distillations.

10 galls. molasses contain

80 lbs. of sweet matter.

90 gallons of water weigh 720lbs.; therefore the proportion is, one part of sweet matter to 9 parts of water—whilst that indicated by Lavoisier is only 4 parts of water to 1 part of sugar.[a]

It is obvious how much richer this last must be, and that the fermentation thus produced has an energy far superior to the other. Thence results a rapid production of spirit, operated in a short time; whilst that of the rum distiller languishes more or less, and a slow fermentation wastes part of the spirit which it produces, even as it is forming.

2dly. Bodies evaporate in proportion to the extent of their surface. One hogshead of 100 gallons, should contain, according to Lavoisier's composition, the elements of 50 gallons of spirit, at 19°; whilst that of the rum distiller contains only 12. Now, as every fermentable liquor requires open vessels, the hogshead of the rum distiller loses as much spirit as that of Lavoisier: hence it is plain how far the above proportion operates to the disadvantage of the fermer.

3dly. Another source of loss arises in the distilling vessels themselves. Nothing is more imperfect than the stills of a whiskey distillery. Lavoisier's were so perfect, that he made the analysis and the synthesis in the most delicate operations. [b] The vessels of the whiskey distillers, far from being hermetically closed, allow the spirit to evaporate through every joint. And this is not all: corroded by the acetous acid, they are full of small holes, particularly in the cap, where all the vapors collect themselves, as in a reservoir. It is easy to conceive with what rapidity they escape, which occasions a considerable waste of liquor. In proof of the truth of this observation, we may refer to the smell of whiskey, so strongly perceivable on the roads leading to a distillery, and preceeding from no other cause than that liquor wasting out of bad vessels, to the great loss of the distiller.

4thly. A fourth cause of loss arises from the worm of the still. However careful in keeping the surrounding water cool, there is always one portion of vapor not condensed. This is made more sensible in the winter, when the cold of the atmosphere makes every vapor visible; upon examination, it will be seen that the running stream of liquor is surrounded with it. In my description of my apparatus, I give the means of obviating that evil.

To these several causes, may we not add another? May not the production of spirit be in a ratio to the richness of the fermenting liquor? It is certain,