The works of the Honourable Robert Boyle, Esq., epitomiz'd by Richard Boulton ... ; illustrated with copper plates.

EXPERIMENT XXIV.

* 1.1HAVING put Sallad Oyl into a Glass about the Size of a Turkey's Egg, whose Stem was near ⅓ of an Inch in Diameter, the Liquor reaching up to the Middle of the Stem, we plac'd it in the Receiver, together with the like Vessel fill'd to the same Height with Wa∣ter; and upon drawing out the Air, the Bub∣bles were not only more copious than those of the Water, but rose much sooner as well as longer, continuing till the Pumper was quite tired with Pumping; and what was very re∣markable in this Experiment was, that when the Oyl was put into the Receiver, before the Receiver could be closed, and the Pump put into Action, it subsided near half an Inch in the Stem.

Having put Oyl of Turpentine into a Glass Bubble, we observ'd, That it afforded a good Quantity of Bubbles, which expanded them∣selves in their Ascent, and would sometimes raise the Oyl in the Tube so much as to make it run over.

But besides the foregoing, we try'd the like Experiments with other Liquors, amongst which, a strong Solution of Salt of Tartar afforded very few Bubbles, and those much

later than other Liquors: Spirit of Vinegar likewise yielded very few. Red Wine afforded Bubbles pretty plentifully, which chang'd Pla∣ces by moving in an oblique Ascent, and for∣med a sort of Froth near the Top, which pre∣sently disappear'd: Milk afforded plentiful Bubbles, which elevated that Liquor more than common Water.

We likewise put Eggs into the Receiver, to see whether the Substance contain'd in the Shells would break them; leaving the Film within it whole, as that Substance frozen had done; but it succeeded not.

We put Spirit of Urine into a Glass Egg, filling another up to the Middle of the Neck with common Water; to which we added as much Spirit of Wine as rais'd it half an Inch higher; and into a Glass which differ'd from the former only in having a flat Bottom, we pour'd rectify'd Spirit of Wine, till it rose to ⅔ of the Neck: And the Edges of these three being mark'd, we put them into a Receiver. Upon the Exsuction of the Air the Mixture of Water and Spirit of Wine afforded very few Bubbles: The Spirit of Urin swell'd near an Inch and a half above the Mark, affording Store of Bubbles, which formed a Froth, upon which several larger Bubbles lay, which were plac'd one above another, to the Top of the Tube: The Spirit of Wine afforded Bubbles till we were weary of pumping, which ascended very swiftly, and immediately disappear'd at the Top, first lifting up the Surface of that spiritu∣ous Liquor so as to form a thin Film. And it was further observable, That the Motion of

these Bubbles in their Ascent, was in a strait Line; whereas those of the Water and Wine made a Line, which on each side appear'd like the Teeth of a Saw: And lastly, in this Spirit we took Notice, That the order which these Bubbles ascended in, was in Lines parallel, and of an Equal Distance from each other; the Bub∣bles likewise following each other, in such an order, as to form a sort of Bracelet, one end of which seem'd to rise from a certain Point at the Bottom of the Glass.

When Air return'd into the Receiver, the Bubbles on the Spirit of Wine gradually sub∣sided; yet neither that, nor the Mixture of Water and Spirit were depress'd below the Mark: But the Spirit of Wine continu'd ex∣panded, near half an Inch, which I found to suc∣ceed upon several Tryals.

Notes

• * 1.1

  The former Experi∣ments pro∣secuted with other Liquors.