a poisonous mixture of ether and alchohol that was a popular painkiller, sedative and soporific drug of the 19th century. According to Wikipedia:
During the second half of the 19th century, ether was in vogue as a recreational drug in some places, becoming especially popular in Ireland, as temperance campaigners thought it was an acceptable alternative to alcohol. Indeed until 1890, when it was classified as a poison, more than 17,000 gallons (77,000 L) of ether were being consumed in Ireland, mostly as a beverage.