The process of absorption of pure carbon dioxide by individual drops of water has been studied. It has been shown that, contrary to the assumption of previous workers, the rate of gas absorption of a drop during the period of formation may be very high, especially when the time of formation is short. This is due to the turbulence produced within the drop by the injection of the supply jet, which reduces the resistance to diffusion at the surface of the drop. The absorption coefficient of drops during formation has been shown to be inversely proportional to a function of the time of formation, and directly proportional to the ‘degree of turbulence,’ a concept which can be expressed in terms of orifice dimensions. The influence of the ‘degree of turbulence’ on the magnitude of the overall absorption coeficients used in chemical engineering computations is discussed.

The deterioration of ethanolamine used in absorption plant is attributed principally to the formation of complexes of iron and ethanolamine. These salts have been isolated and synthesized their constitution, properties and the effect of their presence on the absorption process are discussed.

The saturated vapour concentrations at 35" of 21 organo-mercury compounds have been determined by static and dynamic methods and the corresponding partial pressures derived. For 14 of these compounds, together with mercury and mercuric chloride, values at 25' and 45' have also been determined and the constants in the linear pressure-temperature relation calculated. Some correlation between chemical constitution and vapour pressure has been noted. IntroductionDespite their inherent toxicity, the good fungicidal and bactericidal properties of organomercury compounds have encouraged their widespread use in agriculture. To assess the inhalation hazard arising from the use of eradicant sprays and the dressing of stored seed, the clinical data on intrinsic toxicity must be supplemented with knowledge of the approximate volatility of each compound. Since the published vapour pressure data in this field are scanty, it was decided to determine experimentally the saturated vapour concentrations of as many of the organo-mercurials currently in use as could be obtained.Whereas grain is usually stored in a cool atmosphere and the bulk of fruit spraying in this country is over orchard crops, some fungicidal aerosols are employed in greenhouses, notably on tomatoes. Taking into consideration the English climate and the ventilation procedure

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