Sentence:  M. Malaguti finds that dry chlorine, while acting in the dark upon oxacid <WSD>æthers</WSD>, always attacks, and in a uniform manner, the sulphuric <WSD>æther</WSD> which is the base of them. ... The action of potash on the compound chloridized <WSD>æthers</WSD> is also constant and uniform: the results are always chloride of potassium, acetate of potash, and an organic salt with a base of potash, the acid of which is that which existed in the compound chloridized <WSD>æther</WSD>. 
Meaning of the word marked with <WSD> tags:  Any of a class of organic compounds containing an oxygen atom bonded to two hydrocarbon groups.