Experiment _the fourth, Observations of a Prism in a dark Room_ (191, 192.)

Experiment _the fifth, Of the Refracting and Reflecting Prismatical Colours
in a light Room_ (193.)

Experiment _the sixth, On the Vanishing of the_ Iris _of the Prism, upon
the access of a greater adventitious Light_ (194.)

Experiment _the seventh, Of the appearances of the same Colour'd Papers by
Candle-light_ (195, 196).

Experiment _the eighth, Of the Yellowness of the Flame of a Candle_ (197).

Experiment _the ninth, Of the Greenish Blew transparency of Leaf Gold_
(198).

Experiment _the tenth, Of the curious Tinctures afforded by_ Lignum
Nephriticum (from 199 to 203). _Several trials for the Investigation of the
Nature of it_ (from 204 to 206.) Kircher's _relation of this Wood set down,
and examin'd_ (from 206 to 212). _A Corollary on this tenth_ Experiment,
_shewing how it may be applicable for the Discovering, whether any Salt be
of an Acid, or a Sulphureous, and Alcalizate Nature_ (from 213 to 216).

_The eleventh_ Experiment, _Of certain pieces of Glass that afforded this
Variety of Colours; And of the way of so Tinging any Plate of Glass with
Silver_ (from 216 to 219).

_The twelfth_ Experiment, _Of the Mixing and Tempering of Painters
Pigments_ (219, 220, 221).