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

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              <s>
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              ſel. </s>
              <s>Whereas when the Flame went out
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              upon the exſuction of the Air one time
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              (when the Flame retir'd very leaſurely
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              to the top) we perceived it not to be fol­
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              low'd by any ſmoke at all. </s>
              <s>And at an
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              other time the upper part of the Week
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              remaining kindled after the extinction
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              of the Flame, the ſlender ſteam of Fumes
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              that did ariſe aſcended but a very little
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              way, and then after ſome uncertain mo­
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              tions this and that way, did, for the moſt
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              part, ſoon fall downwards. </s>
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              <s>Being deſirous alſo to try whether
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              there would be any difference as well in
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              our Receiver as there is wont to be elſe­
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              where betwixt Candles made of Wax and
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              thoſe made of Tallow, as to their dura­
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              tion; we took ſlender Tapers of white
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              Wax, (commonly called Virgins Wax)
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              that being found to burn with much leſs
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              ſmoke then common yellow Wax: Six
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              of theſe of like bigneſs, and each of them
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              of about the thickneſs of a Swans Quill,
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              we preſſ'd together into one Candle: And
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              having lighted all the Weeks, we let in
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              the above-mention'd Wax into the Re­
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              ceiver, and made what haſte we could to
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              cloſe it up with Cement. </s>
              <s>But though in
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              the mean while we left open the Valve </s>
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