The introduction of measures that don't follow the system, combined with the dropping from common use of a few measures essential to the continuity of the system (dessertspoon, wineglass, and pottle), combined with the redefinition of the teaspoon from to of a fl oz, has gradually left the system little-understood. However, it is still a legal basis for measures in some states, such as Massachusetts, which mandates that "Glass bottles or jars used for the sale of milk or cream to the consumer shall be of the capacity of one gallon, a multiple of the gallon, or a binary submultiple of the gallon."