Page:Micrographia - or some physiological descriptions of minute bodies made by magnifying glasses with observations and inquiries thereupon.djvu/366

Rh explication of filtration, and several other Phænomena; such as the motion of Bodies on the surface of Liquors;  several Experiments mention'd to this ''purpose. Of the height to which the'' water may rise in these Pipes; and a conjecture about the juices of Vegetables, & ''the use of their pores. A further explication of Congruity:'' And an attempt of solving the Phænomena of the strange Experiment of the suspension of the Mercury at a much greater height ''then thirty inches. The efficacy of'' immediate contact, and the reason of it.

Observ. 7.Of Glass drops.

Several Experiments made with ''these small Bodies. The manner of the'' breaking and flawing of them, explicated ''by Figures. What other bodies'' will be flawed much in the same manner: so other tryals, and a description of the Drops themselves: some conjectures at the cause of the Phænomena, indeavoured to be made probable by several Arguments and Experiments. An Experiment of the expansion of Water by heat, and shrinking by cold: the like Proprieties suppos'd in Glass drops, and what effects proceed from them: the seven Propositions on which the conjectures are grounded. Experiments to shew, that bodies expand ''by heat. The manner of making'' Thermometers, and the Instrument ''for graduating them. The manner of'' graduating them, and their use: Other Experiments to prove the expansion ''of bodies by heat. Four experimental'' Arguments to prove the expansion of Glass by heat: further prov'd by the Experiment of boyling Alabaster; ''which is explicated. An explication'' of the contracting of heated Glass upon ''cooling. An explication how the'' parts of the Glass become bent by sudden cold, and how kept from extricating themselves by the contignation of the Glass drop; which is further explicated by another Experiment made with a hollow Glass ball: the reason of the flying asunder of the parts further explicated: that 'tis probable these bodies may have many flaws, though not visible, and why: how a gradual heating and cooling does put the parts of Glass, and other hardned bodies, into a looser texture.

Observ. 8.Of Fiery Sparks.

The occasion and manner of making this Experiment: divers Observations set down in order to the finding out the reasons: some conjectures concerning it, which are endeavoured to be explicated and confirm'd by several Experiments and Reasons: the Hypothesis a little further explicated. Some Observations about the Globular Figure: and an Experiment of reducing the filings of Tin or Lead to exactly round Globules.

Observ. 9.Of Fantastical Colours.

The texture of Muscovy Glass; its Figures: what other Bodies are like it: that it exhibits several colours, and how: several Observations and Experiments about those colours: the reason why on this occasion the nature of colours ''is inquir'd into. A conjecture at'' the reason of these colours explicated by several Experiments and Reasons: First, by continual cleaving the Body till it become colour'd. Secondly, by producing all kinds of colours with ''two flat Plates of Glass. Thirdly, by'' blowing Glass so thin in the Lamp, till ''it produce the same effect. Fourthly, by'' doing the same with Bubbles of divers other transparent Bodies: the reasons of the colours on nealed Steel, where by the way the causes of the Rh