[Illustration: THE TIRAGE OR BOTTLING OF CHAMPAGNE.]
The bottles are first placed in a horizontal position, the side to be kept uppermost being indicated by a daub of whitewash, and are stacked in rows of varying length and depth, one above the other, to about the height of a man, with narrow laths between them. Thus they will spend the summer, providing all goes well; but in about three weeks' time the process of gas-making inside the bottles is at its height, and a period of considerable anxiety to the Champagne manufacturer ensues, through his dread lest an undue number of them should burst from the expansion of the carbonic acid gas generated in the wine. The glucometer notwithstanding, it is impossible to check a certain amount of breakage, especially when a hot season has caused the grapes, and consequently the raw wine, to be sweeter than usual. Moreover, when once _casse_ or breakage sets in on a large scale, the temperature of the cellar is raised by the volume of carbonic acid gas let loose, which is not without its effect on the remaining bottles. Not only does the increased temperature unduly accelerate fermentation, but the mere shock of one bottle exploding often starts such of its neighbours as are predisposed that way, in addition to the direct havoc wrought by the heavier fragments of flying glass. The only remedy is the instant removal of the wine to a lower temperature whenever this is practicable.
A manufacturer of the pre-scientific days of the last century relates how one year, when the wine was rich and strong, he only preserved 120 out of 6000 bottles; and it is not long since that 120,000 out of 200,000 were destroyed in the cellars of a well-known Champagne firm. M. Mauméné, moreover, relates that in 1850 he was called in to consult about the checking of a _casse_, which had already reached 96 per cent.[413] Over-knowing purchasers affect to select a wine which has exploded in the largest proportion in the cellars, as being well up to the mark as regards its effervescence, and are in the habit of making inquiries as to its performances in this direction.
It is evident that, in spite of the teachings of science, the bursting of Champagne bottles has not yet been reduced to a minimum, for whereas in some cellars it averages 7 and 8 per cent, and rises to 15 when the pressure is unusually strong, in others it rarely exceeds 2-1/2 or 3. The period between May and September is that in which the greatest destruction takes place. In the month of October, the first and severest breakage being over, the newly-bottled wine is definitively stacked in the cellars in piles from two to half a dozen bottles deep, from six to seven feet high, and frequently a hundred feet or upwards in length. Usually the bottles remain in their horizontal position, in which they gradually develop two essential qualities, that of effervescing well and that of travelling satisfactorily, for about eighteen or twenty months, though some firms, who pride themselves upon shipping perfectly matured wines, leave them thus for double this space of time. During this period the temperature to which the wine is exposed is, as far as practicable, carefully regulated; for the risk of breakage, though greatly diminished, is never entirely at an end.