Show A series of experiments has been conducted at the salt lake city station of the bureau of mines to determine the effect of positive pressures and vacuum on the transformation of organic org anic matter in shale to bitumen and interesting results have been obtained definite gas pressures are produced on heating hea tings shale for a given time and temperature in an enclosed space seemingly indicating a univ arient type of equilibrium it is hoped that a continuation of this work using various atmospheres etc will give definite information concerning the actual mechanism of tion analyses of the bases evolved which are necessary for this purpose and in completion of previous work are being made |