The Preface.

Expels ^e less Familiar , and more Lai or iota opc-ryallof rations of Cbymisiry would probably havef their frighted, I purposely dtclin din what 1 writer irri' to him , the setting down any Number of sucho insert Chymicall Experiments, as, by being very ela-hework berate or tedim , would either require much\d exa- s hill,o Y exercise Its patience. And yet that‘n^pre- tJU f ort tf Experiments is exceedinglyfmains N »merow, and might more than a little in-already the History "of Colours, those that are

a mind VerS 'd in ( hymical procestes, will , I presume ,id exa- ? a fih rdlotv me.

that , And ( Lastly) for as much as I have oc ca -in this l l °n more th an once in my several Writings to

, treed either pcrpofely or incidentally of matters

n as to relating to (olours ; / did mt, perhaps , con-t them. ce ' l ' Ue m ) fetfoblig’dsto deliver in one Treatisein the that I would fay concerning that subje8.written Sut to conclude, by summing ftp what II partly would fay concerning what I have and whate want i, C not done, in the following Papers ; Ivariety 'hall not ( on the one fide) deny, that con-, mA te- fid?ring that I pretended not to write an ac-

igEX' CUrate Treatise of Colours, but an Occast-hatical °*‘f E f a y to acquaint a private friend withshould ™r at f efl occurrd to me of the things / had•me to ou ght or tryd concerning them ; I might

them, 1 did enough for once, if I did clearly

our agg p ) M sthfully f c t down , though not all the

(jrborfl x pcnrnents i could, yet at leapt such atht variety