Another form of adulteration or misbranding which is quite common is the representation of a water as being naturally effervescent, in which the effervescence is produced by artificial means. The great difficulty of bottling a naturally effervescent water so as to preserve its qualities is well known. Usually the quantity of gas present is not large enough to give the desired results. On the other hand, the difficulty of introducing it into the bottle without the loss of its natural gas is very great. The practice has grown up in many places of collecting the gas which comes from effervescent waters and after compressing it to use the compressed gas for charging the water after it is bottled. This is a practice to which no objection can be made whatever. Even still waters may be thus carbonated and take on effervescent properties which render them more valuable and more desirable, and no objection can be made to this method of procedure. In all such cases the article must be regarded as either misbranded or adulterated if offered to the consumer as naturally effervescent.