Pag. 142. l. 20. These words, _And to manifest_, with the rest of what is by a mistake further printed in this fourth Experiment, belongeth, and is to be referred to the end of the second Eperiment, p.137. pag. 145. l. 1. leg. _matter_. 146. l. 4. leg. _Bolts-head_. pag 161. in the marginal note l. 2. dele _de_ ib. l. 3. lege lib 1. p 163. l. ult. insert _where_ between the words _places_ and _the_. p. 164 l. 1. dele _that_. ibid, l. 8. leg _Epidermis_. ibid. l. 19 leg. 300. for 200. p. 169. l. 22. leg. _into it_. p. 170. l. 23. & 24. leg. _Some Solutions hereafter to be mentioned_, for _the Solutions of Potashes_, and other _Lixiviate Salts_. p. 171. l. 6. insert _part of_ between the words _most_ and _dissolved_ p. 176. l. ult. insert the participle _it_ between the words _Judged_ and _not_ p. 234. l. 4. leg. _Woud-wax_ or _Wood-wax_. p. 320 l. 29. leg. _urine_ for _urne_. * * * * * _THE_ _EXPERIMENTAL HISTORY_ _OF COLOURS BEGUN._ THE FIRST PART. CHAP. I. 1 I have seen you so passionately addicted, _Pyrophilus_ to the delightful Art of Limning and Painting, that I cannot but think my self obliged to acquaint you with some of those things that have occurred to mee concerning the changes of Colours. And I may expect that I shall as well serve the _Virtuosi_ in general, as gratifie you in particular, by furnishing a person, who, I hope, will both improve my Communications, and communicate his Improvements, with such Experiments and Observations as may both invite you to enquire seriously into the Nature of Colours, and assist you in the Investigation of it. This being the principal scope of the following Tract, I should do that which might prevent my own design, if I should here attempt to deliver you an accurate and particular Theory of Colours; for that were to present you with what I desire to receive from you; and, as farr as in mee lay, to make that study needless, to which I would engage you.