The most usual process, where soda-ash is to be made, is the ''carbonating.''

He checked his suit dials... oxygen for twenty-two hours, heater pack fully charged, soda-ash only half saturated... it would do.

There is consequently a second round given to the goods, consisting of a bowk in soda-ash, followed by the second and usually final chemicking.

If it is boiled down without further purification, the resulting soda-ash is not of the first quality, but it is sufficiently pure for many purposes.

Soda-ash (as well as caustic soda) is sold by degrees of ''available soda.''

The Manufacture of Soda-ash from Salt-cake by the Leblanc process.-Thisprocess consists in heating a mixture of commercial