What it did: The company bought various gas and heating companies in Chicago with a capital of $25 million. It was founded in 1887.
Where it is now: It was acquired 10 years later and has evolved into a subsidiary of Integrys Energy Group, a publicly-traded company. The original company, after merging with Peoples Gas, was dropped from the Dow in 1915.
Sources: Wikipedia, "Chicago Securities" Volume 4