Abstract
This essay is written for the introduction of authors' researches whichwere awarded the Japan Fuel Society prise for the 33rd year of showa (1958).
The authors found humic acids and their alkali salts effective and suitable as conditioner of circuating mud for oil well drilling in case of exploration and exploitation of crude oil and natural gas.
In this essay the authors stated the progress of industrialization of their manufacturing process and then explained their manufacturing process and properties of the products by their process.
Further they stated the outline of the results up to the present of their researches for another purposes except oil well drilling.
In conclusion, the authors stated their intention of their contribution to the industrial circles in Japan by making development of new and original industry for the utilization of coal through their researches in future.
