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It is a common observation that drops of a liquid may exist for some time on the surface of the same liquid in bulk before coalescence occurs. Such drops are frequently observed during the process of refluxing an organic solvent, the splashing of raindrops in puddles, the drip of water from oars, or the splashing of sea water against a rocky shore. They are sufficiently interesting to have attracted the notice of several men whose observations have appeared from time to time in the scientific periodicals, e.g., Lord Rayleigh (8), Reynolds (9), Kaiser (5), Seth (10), and Mahajan (7).The drops are formed in two distinct ways. The falling drop may fail to penetrate the surface of the bulk liquid and may rest there, preserving its identity for a matter of many seconds, or it may fall with such force 1205

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Molecular models which reflect recent knowledge of all the known types of symmetry in molecular configuraatomic structure and provide a versatility not found in tion.older models have been constructed.Various uses of these models for instruction and study Each atom (except hydrogen) is represented by a cube in the several fields of chemistry are suggested, and it is with truncated corners, making a fourteen-sided figure indicated that a study of the models themselves may in with eight faces of equilateral triangles and six faces of certain cases aid in resolving questions of molecular strucsquares. This permits the construction of models having ture and properties.