IV. Morphological and Optical Properties of Crystalline Pyrophosphates Refractive Crystal System, Class, and Habit Indices

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To gain an insight into the phenomena that are initiated when superphosphate is placed in soil, tablets containing monocalcium phosphate monohydrate were placed in several soils and observed directly. Petrographic examinations and supporting chemical studies gave information on chemical reactions associated with the dissolution process and on the transport of materials to and from the tablet—factors that bear upon the distribution and chemical combination of the phosphorus and thus upon agronomic response. The results suggest that capillary flow was a principal mechanism in the movement of phosphate solution away from the tablet. Vapor‐phase transport of water to the tablet apparently controlled the rate of dissolution. A significant part of the P remained at the tablet site as dicalcium phosphate, anhydrous or dihydrated. The dissolution process was affected by soil type, soil moisture content, humus content, microbiological activity, capillarity of soil and tablet, time, and temperature.

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SYNTHESISkiODKKN industry often automatically records pH. temperature, pressure, etc., for reasons of plant efficiency, and analysis of individual spot samples is commonly used in the control of an industrial process. W here process materials are gaseous or liquid, methods of continuous analysis are often possible, though these have not received the attention their importance justifies. Individual papers involving continuous analysis do not permit the analyst to include details which would enable readers to appreciate the over-all advantages and the limitations of continuous analysis.Jl is for this reason that we take particular pleasure in publishing the following seven articles on "Analyti-cal Control for Ammonia Synthesis", prepared by Karl H. Brown and co-workers at Tennessee Valley Authority, Wilson Dam, Ala. In these we have an excellent representation of development and application in this type of analysis for control of an important industrial process.Further, to illustrate the conventional approach of the analyst in the determination of a specific compound and the compromises needed to develop a procedure for continuous recording, two articles on determining methyl bromide in air follow immediately after the group of seven.h. T. H u,i.i:tt.

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