Having in the former Discourse, from the Fundamental cause of Colour, made it probable, that there are but two Colours, and shewn, that the _Phantasm_ of Colour is caus’d by the sensation of the _oblique_ or uneven pulse of Light which is capable of no more varieties than two that arise from the two sides of the _oblique_ pulse, though each of those be capable of infinite gradations or degrees (each of them beginning from _White_, and ending the one in the deepest _Scarlet_ or _Yellow_, the other in the deepest _Blue_) I shall in this _Section_ set down some Observations which I have made of other colours, such as _Metalline_ powders tinging or colour’d bodies and several kinds of tinctures or ting’d liquors, all which, together with those I treated of in the former Observation will, I suppose, comprise the several subjects in which colour is observ’d to be inherent, and the several manners by which it _inheres_, or is apparent in them. And here I shall endeavour to shew by what composition all kind of compound colours are made, and how there is no colour in the world but may be made from the various degrees of these two colours, together with the intermixtures of _Black_ and _White_. And this being so, as I shall anon shew, it seems an evident argument to me, that all colours whatsoever, whether in fluid or solid, whether in very transparent or seemingly _opacous_, have the same efficient cause, to wit, some kind of _refraction_ whereby the Rays that proceed from such bodies, have their pulse _obliquated_ or confus’d in the manner I explicated in the former _Section_; that is, a _Red_ is caus’d by a duplicated or confus’d pulse, whose strongest pulse precedes, and a weaker follows: and a _Blue_ is caus’d by a confus’d pulse, where the weaker pulse precedes, and the stronger follows. And according as these are, more or less, or variously mixt and compounded, so are the _sensations_, and consequently the _phantasms_ of colours _diversified_.