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I described experiments to illustrate what we mean by monogenetic and polygenetic colours, and indicating that the monogenetic colours are mainly included in the group of substantive colours, whilst the polygenetic colours are mainly included in the adjective colours. I also said there was a kind of borderland whichever mode of classification be adopted.
In the various colours and dyes we have all phases, and the monogenetic shades almost imperceptibly into the polygenetic.
Monogenetic means capable of generating one. These bodies require a special treatment to bring out or develop the colours, for there may be several that each is capable of yielding. We may consider them as colour-giving principles, and so we term them polygenetic colours. Polygenetic means capable of generating several or many.
Thus, for example, there are colours that are fixed on the fibre either directly like indigo, and so are substantive, or they may be, and generally are, applied with a mordant like the adjective and polygenetic colours; examples of these are Coerulein, Alizarin Blue, and a few more.
II. Adjective colours, fixing themselves only in conjunction with a mordant or mordants on animal or vegetable fibres, and including all the polygenetic colours. III. Mineral or pigment colours.
If we think teleologically, we see the unity of mankind, also in case of a polygenetic origin, in the unity of the metaphysical and teleological cause which called mankind into existence; and to rational beings, endowed with mind, as men are, the metaphysical bond is certainly stronger than the physical.
In the case of the polygenetic class, the idea is necessarily twofold. The dyeing materials are not colours, only colour generators. Hence in all cases the fabric must be prepared with the twofold purpose first, of using a metallic or other agent, capable of yielding, with the dye material, the desired colour; and secondly, of yielding it on the fibre in an insoluble and permanent form.
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