Some aspects of the chemistry of coal tars. I. Chemical nature

The chemical, and to a more limited extent the physical, properties of coal tars of different origins are reviewed to serve as a background to the work to be described in later parts, mainly on tars derived from down‐jet combustion of bituminous coal. To the same end, the chemistry of the amorphous constituents of coal tars is separately considered, and a classification on the basis of known data is given.