IN a paper by Findlay and Creighton (Trans., 1910, 97, 536) the results of an investigation of the solubility of carbon dioxide and nitrous oxide in water in presence of colloids and fine suspensions were communicated. I n view of the results then obtained it was decided to continue the investigation; and for the purpose of ascertaining in how far the behaviour of colloids is a peculiar one, the

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THE solubility of carbon dioxide in water in the presence of starch was determined by Pindlay and Williams (T., 1913, 103, 636) at pressures lower than atmospheric, and by Findlay and Creighton (T., 1910, 97, 536) a t pressures above that of the atmosphere. From these determinations it appeared that the solubility increases slightly and continuously as the pressure is increased. As this behaviour is different from that found in the case of other colloids it seemed advisable t o re-determine this solubility.The apparatus employed was the same as that previously used, but it has been found possible t o improve its working and manipulation so as t o increase the accuracy of the measurements. We believe the accuracy of the present determinations may be taken as not much less than 0.1 per cent. I n the previous determinations thO initial and final volume of the gas in the burette was read a t different pressures, and the dead space correction which had to be introduced was rather large. I n the present series of determinations the dead-space correction was eliminated by reducing the pressure on the gas in the burette and connecting capillary to atmospheric pressure after the absorption of the gas. The volume of gas was, therefore, always read a t the same pressure. This reading can be done more accurately than the reading of pressure, and although readings of the pressure must also be made, errors in such readings have comparatively little influence on the final result. By working in this way, also, the calculation becomes simplified, the solubility being given by the expression :

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treated fully in four of the chapters. Literature references are given in great detail.The physical make-up of the book is excellent.It has been a great pleasure and a privilege to the writer to have had the opportunity of reviewing this splendid treatise.