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It has been shown that a complex having the probable formula I(SCN)2" is formed by oxidation of iodide ion or elemental iodine in solutions containing potassium thiocyanate. Hydrogen peroxide or potassium iodate effect nearly quantitative conversion of the iodine to the complex form. The properties of solutions of I(SCN)2~a re described and values for the equilibrium quotient for the reaction I(SCN)2~u¿I_ + (SCN)2 are reported at various temperatures.In an earlier paper,8 it was postulated that a rather stable complex, I2SCN-, is formed when iodine is dis-(1) Support for this work by the National Science Foundation (Research Grant NSF G-22583) is gratefully acknowledged.(2) This paper is based upon portions of a Ph.D. thesis by Calvin H.

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If you were to ask a random sample of students from your school if they liked mathematics, what do you suppose their responses would be? Almost certainly most of them would respond negatively and some would do so with considerable vigour. But what of the others? Some students do like mathematics and we might well ask why this is so? Do you suppose it is because these students realise that knowledge of mathematics is a necessary survival skill in today’s increasingly technological society? Surely the answer is no. Do you suppose it is because they realise that mathematics has many useful real life applications or that lack of knowledge of mathematics will effectively prevent them for entering college in most disciplines? Again the answer is almost surely no. Certainly mathematics is relevant and we should teach our students that this is so and we should teach them useful and appropriate applications as well. At the same time, it is my experience that student attitudes towards mathematics are much like they are towards exercise—in general, they do not exercise because it contributes to good health, but because exercising is usually done in the form of a game or a competition that they find attractive in and of itself. Similarly, what turns students on to the study of mathematics and provides the needed motivation for learning are the remarkable patterns and surprising results with which our subject is so replete. Successful teachers realise this fact and utilise it to maintain a high level of interest and enthusiasm which enables them at the same time to teach ideas which, while useful and necessary, may be more prosaic.