To proceed therefore; I suppose, that all transparent colour’d bodies, whether fluid or solid, do consist at least of two parts, or two kinds of substances, the one of a substance of a somewhat differing _refraction_ from the other. That one of these substances which may be call’d the _tinging_ substance, does consist of distinct parts, or particles of a determinate bigness which are _disseminated_, or dispers’d all over the other: That these particles, if the body be equally and uniformly colour’d, are evenly rang’d and dispers’d over the other contiguous body; That where the body is deepest ting’d, there these particles are rang’d thickest, and where ’tis but faintly ting’d, they are rang’d much thinner, but uniformly. That by the mixture of another body that unites with either of these, which has a differing refraction from either of the other, quite differing effects will be produc’d, that is, the _consecutions_ of the confus’d pulses will be much of another kind, and consequently produce other _sensations_ and _phantasms_ of colours, and from a _Red_ may turn to a _Blue_, or from a _Blue_ to a _Red_, &c. Now, that this may be the better understood, I shall endeavour to explain my meaning a little more sensible by a _Scheme_: Suppose we therefore in the seventh _Figure_ of the sixth _Scheme_, that ABCD represents a Vessel holding a ting’d liquor, let IIIII, &c. be the clear liquor, and let the tinging body that is mixt with it be EE, &c. FF, &c. GG, &c. HH, &c. whose particles (whether round, or some other determinate Figure is little to our purpose) are first of a determinate and equal bulk. Next, they are rang’d into the form of _Quincunx_, or _Equilaterotriangular_ order, which that probably they are so, and why they are so, I shall elsewhere endeavour to shew. Thirdly, they are of such a nature, as does either more easily or more difficultly transmit the Rays of light then the liquor; if more easily, a _Blue_ is generated, and if more difficultly, a _Red_ or _Scarlet_. And first, let us suppose the tinging particles to be of a substance that does more _impede_ the Rays of light, we shall find that the pulse or wave of light mov’d from AD to BC, will proceed on, through the containing _medium_ by the pulses or waves KK, LL, MM, NN, OO; but because several of these Rays that go to the constitution of these pulses will be slugged or stopped by the tinging particles E, F, G, H; therefore there shall be _secundary_ and weak pulse that shall follow the Ray, namely PP which will be the weaker: first, because it has suffer’d many refractions in the impeding body; next, for that the Rays will be a little dispers’d or confus’d by reason of the refraction in each of the particles, whether _round_ or _angular_; and this will be more evident, if we a little more closely examine any one particular tinging _Globule_.