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a weak long-range attraction in addition to the strong short-range repulsion between colloidal particles.The traverse pictures of the specimen that remained without disturbance over several weeks did not exhibit any detectable change from Figure 2. From this observation the semidilute solutions of highly charged particles are found to form the comparatively stable spatial structures of ordered and disordered states, the existence of which was demonstrated also by the cross correlation data of Clark et al.8 and by direct observation by means of ultramicroscopes.9 As is widely accepted,10 11the ordering formation in the concentrated suspensions is well described by the Alder-Wainwright transitio 1234567n11 in which the interparticle repulsion and the wall effect are premised only. However, it is not possible for the repulsion-only assumption to explain the stable existence of isolated crys-

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