Experiments and Considerations Touching Colours | Page 3

obvious Instances of the changes of colours. Nor have I much medled with those familiar Ph?nomena wherein man is not an Idle spectator; such as the Greenness produc'd by salt in Beef much powder'd, and the Redness produc'd in the shells of Lobsters upon the boyling of those fishes; For I was willing to leave the gathering of Observations to those that have not the Opportunity to make Experiments. And for the same Reasons, among others, I did purposly omit the Lucriferous practise of Trades-men about colours; as the ways of making Pigments, of Bleanching wax, of dying Scarlet, &c. though to divers of them I be not a stranger, and of some I have myself made Tryall.
Next; I did purposely pass by divers Experiments of other Writers that I had made Tryall of (and that not without registring some of their Events) unless I could some way or other improve them, because I wanted leasure to insert them, and had thoughts of prosecuting the work once begun of laying together those I had examin'd by themselves in case of my not being prevented by others diligence. So that there remains not a little, among the things that are already published, to imploy those that have a mind to exercise themselves in repeating and examining them. And I will not undertake, that none of the things deliver'd, ev'n in this Treatise, though never so faithfully set down, may not prove to be thus farr of this Sort, as to afford the Curious somewhat to add about them. For I remember that I have somewhere in the Book it self acknowledged, that having written it by snatches, partly in the Counntrey, and partly at unseasonable times of the year, when the want of fit Instruments, and of a competent variety of flowers, salts, Pigments, and other materials made me leave some of the following Experiments, (especialy those about Emphatical Colours) far more unfinish'd than they should have been, if it had been as easie for me to supply what was wanting to compleat them, as to discern. Thirdly to avoyd discouraging the young Gentleman I call Pyrophilus, whom the less Familiar, and more Laborious operations of Chymistry would probably have frighted, I purposely declin'd in what I writ to him, the setting down any Number of such Chymicall Experiments, as, by being very elaborate or tedious, would either require much skill, or exercise his patience. And yet that this sort of Experiments is exceedingly Numerous, and might more than a little inrich the History of Colours, those that are vers'd in Chymical processes, will, I presume, easily allow me.
And (Lastly) for as much as I have occasion more than once in my several Writings to treat either porposely or incidentally of matters relating to Colours; I did not, perhaps, conceive my self oblig'd, to deliver in one Treatise all that I would say concerning that subject.
But to conclude, by summing up what I would say concerning what I have and what I have not done, in the following Papers; I shall not (_on the one side_) deny, that considering that I pretended not to write an accurate Treatise of Colours, but an Occasional Essay to acquaint a private friend with what then occurrd to me of the things I had thought or try'd concerning them; I might presume I did enough for once, if I did clearly and faithfully set down, though not all the Experiments I could, yet at least such a variety of them, that an attentive Reader that shall consider the Grounds on which they have been made, and the hints that are purposely (though dispersedly) couched in them, may easily compound them, and otherwise vary them, so as very much to increase their Number. And yet (_on the other side_) I am so sensible both of how much I have, either out of necessity or choice, left undone, and of the fruitfullness of the subject I have begun to handle; that though I had performed far more then 'tis like many Readers will judge I have, I should yet be very free to let them apply to my Attempts that of Seneca, where having spoken of the Study of Natures Mysteries, and Particularly of the Cause of Earth-Quakes, he subjoins.[1] _Nulla res consummata est dum incipit. Nec in hac tantum re omnium maxima ac involutissim��, in qua etiam cum multum actum erit, omnis ?tas, quod agat inveniet; sed in omni alio Negotio, long�� semper �� perfecto fuere Principia._
[1] L. Ann? Senec? Natur. Quest. l. 6. c. 5.
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The Publisher to the READER.
_Friendly Reader,_
Here is presented to thy view one of the Abstrusest as well as the Gentilest Subjects of Natural Philosophy, the _Experimentall History of Colours_; which though the Noble Author be pleased to