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From a photograph by Professors Imbert and Bertin-Sans; reproduced by the courtesy of the "Presse Medicale," Paris. From a photograph taken by Dr. W.L. Robb of Trinity College. From a photograph by A.A.C. Swinton, Victoria Street, London. Exactly what kind of a force Professor Röntgen has discovered he does not know.
Others are less complicated, and also less exact, but still require quite a troublesome manipulation such, for example, as the process of Pettenkofer, as modified by Fodor, that of Hesse, etc. Montsouris Apparatus. Smith's Minimetric Apparatus. Bertin-Sans Apparatus. Bubbling Glass. Pipette. Arrangement of the U-shaped Tube. It is from such efforts that have resulted the processes of Messrs.
Smith. Lunge, Bertin-Sans, and the apparatus of Prof. It is of the highest interest to ascertain the proportion of carbonic acid in the air, and especially in that of inhabited places, since up to the present this is the best means of finding out how much the air that we are breathing is polluted, and whether there is sufficient ventilation or not.
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