202Observations on other Spiders, and
their Webs, together with an examination
of a white Substance flying up
and down in the Air after a Fog.
203Obser. 49.Of an Ant.
That all small Bodies, both Vegetable
and Animal, do quickly dry and
wither. The best remedy I found to hinder
it, and to make the Animal lye still
204to be observ'd. Several particulars related
of the actions of this Creature;
205and a short description of its parts.
Obs. 50.Of the wandring Mite.
206A description of this Creature, and
of another very small one, which usually
207bore it company. A Conjecture at
the original of Mites.
Observ. 51.Of a Crab-like Insect.
208A brief description of it.
Observ. 52.Of a Book-worm.
209A description of it; where by the
way is inserted a digression, experimentally
explicating the Phænomena
210of Pearl. A consideration of its
digestive faculty.
Observ. 53.Of a Flea.
211A short description of it.
Observ. 54.Of a Louse.
212A description of its parts, and some
213notable circumstances.
Observ. 55.Of Mites.
The exceeding smalness of some
Mites, and their Eggs. A description
214of the Mites of Cheese: and an intimation
of the variety of forms in other
215Mites, with a Conjecture at the reason.
Ob. 56.Of small Vine-Mites.
A description of them; a ghess at
their original; their exceeding smalness
216compar'd with that of a Wood-louse,
from which they may be suppos'd to come.
Observ. 57.Of Vinegar-worms.
217A description of them, with some
considerations on their motions.
Obs. 58.Of the Inflexion of the Rays of Light in the Air.
218A short rehearsal of several Phænomena.
219An attempt to explicate
them: the supposition founded on two
Propositions, both which are indeavoured
to be made out by several Experiments.
What density and rarity
is in respect of refraction: the refraction
of Spirit of Wine compared with
220that of common Water: the refraction
of Ice. An Experiment of making an
Undulation of the Rays by the mixing
of Liquors of differing density. The
221explication of inflection, mechanically
and hypothetically: what Bodies
have such an inflection. Several Experiments
to shew that the Air has
222this propriety; that it proceeds from
the differing density of the Air: that
the upper and under part of the Air
223are of differing density: some Experiments
to prove this. A Table of the
strength of the spring of the Air,
answering to each degree of extension;
224when first made, and when repeated.
225Another Experiment of compressing
226the Air. A Table of the strength of the Air,
answering to each compression
and expansion; from which the height
