The vegetable constituents of coals occur in complex organic mixtures that have been recognized by coal technologists and chemists as well as paleobotanists. However, the diverse interpretations and the nomenclatures involved in these different procedures have resulted in a confusion of data. The present communication presents a number of new observations on the banded ingredients of bituminous coals and their combustion properties, particularly with reference to low temperature carbonization. It is believed that the results are of significance both in the utilization of low-grade bituminous coals and in the academic investigation of the problem of the origin of coal. It is suggested that all plant tissues and products contribute to coal accumulation and that the controversy over the lignin or cellulose origin of coal is without meaning.

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