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In my first paper “On the presence of Liquid Carbon Dioxide in Mineral Cavities” (‘Journal of the Chemical Society,' February 1876), I mentioned having noticed a remarkable repulsion of the bubbles in fluid-avities when they were approached by a heated body. I at first regarded these movements as similar to those observed by Mr. Sang and Dr. Hunter (Proceedings of the Royal Society of Edinburgh, 1872-73, p. 126) in cavities of Iceland spar; but with reference to the position of the source of heat, I have since found that they occurred in quite the reverse direction. The motion noticed by Mr. Sang was a repulsion of the liquid; that which I recorded was a repulsion of the gas by the heated body. Here I may as well say that this refers to the real and not the apparent direction of the motion as seen under the microscope.

II. On attraction and repulsion of bubbles by heat