Sentence:  Good <WSD>barilla</WSD> usually contains, according to Dr. Ure's analysis, 20 per cent. of real alkali, associated with muriates and sulphates, chiefly of soda, some lime, and  alumina, with very little sulphur. 
Meaning of the word marked with <WSD> tags:  Impure soda obtained from the ashes of any seashore plant, or kelp.