Igneous Complex of undoubtedly much greater and more prolonged than was actually required for the purposes of the experiment, the temperature of the kiln being not less than 1,200 degrees Cent. The bubbles are too large to show Brownian movement. Scale-<TH.ou-satid.ttisofan. inch. FIG. 3.-Liquid inclusions obtained in glass by heating a sealed tube containing water beyond the critical temperature. P.S.-Since writing the above I have repeated the experiment with similar success, and on this

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... ion some of the numerous inclusions show Brownian movement of the enclosed bubble. -C. E. B.