Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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              or from the Union of two or three of
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              thoſe numerous bubbles which were then
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              generated below the bottom of the Pipe,
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              where we could not ſee what was done a­
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              mong them. </s>
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              <s>Another thing we noted in our bubbles
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              was, That whereas in ordinary ones the
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              Air, together with the thin film of Water
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              that inveſts and detains, is wont to ſwell
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              above the ſurface of the Water it ſwims
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              on, and commonly to conſtitute Hemiſ­
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              pherical Bodies with it, the little parcels
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              of Air that came up after the Receiver
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              was pretty well empty'd, did not make
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              protuberant bubbles, but ſuch whoſe up­
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              per ſurface was either level with or be­
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              neath that of the Water, ſo that the up­
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              per ſurface being uſually ſomewhat con­
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              vex, the leſs protuberant parts of it had
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              a pretty quantity of Water remaining a­
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              bove them. </s>
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              <s>We alſo further obſerv'd, That where­
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              as in the bubbles that firſt appear'd in
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              the Pipe, the aſcending Air did, as in o­
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              ther common bubbles, make its way up­
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              wards, by dividing the Water through
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              which it paſſ'd, in thoſe bubbles that ap­
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              pear'd at the latter end of our Experi­
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              ment, when the preſſure of the little ex-</s>
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