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Aggregation of the silicate ion has been studied by accurate pH titrations of sodium silicate-sodium perchlorate solutions ( "a+] being kept constant) at constant [Sil-concentration. z v. pH-curves (z = average charge per silica unit) were calculated from the experimental data. These curves could be explained by assuming the formation o f "core + links" complexes of the general composition HSSiO,-(H,SiO,)..The data which cover a limited range are compatible both with the formation of a single complex (n = 2, probably a ring) and with an unlimited mechanism (n = 1. 2, 3 . . . .).Equilibrium constants fur both mechanisms are given. --*) Cf. L. G. Sill&, On equilibria with plynudear complexes, Rec. trav. &em. 75, 705 (1956).