Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660
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              ficult a matter, to keep out the Air from
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              getting at all in at any imperceptible hole
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              or flaw whatſoever, in a Veſſel immedi­
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              ately ſurrounded with the compreſſed At­
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              moſphere, that in ſpight of all our care
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              and diligence, we never were able totally
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              to exhauſt the Receiver, or keep it when
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              it was almoſt empty, any conſiderable
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              time, from leaking more or leſs: although
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              (as we have lately intimated) by unwearyed
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              quickneſs in plying the Pump, the inter­
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              nall Air can be much faſter drawn out
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              then the external can get in, till the Re­
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              ceiver come to be almoſt quite empty.
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              <s>And that's enough to enable men to diſ­
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              cover hitherto unobſerved
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              Phænomena
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              of
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              Nature. </s>
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              <s>The Experiments therefore of the firſt
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              ſort, will, I fear, prove the onely ones
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              wherewith my Avocations will allow me
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              to entertain Your Lordſhip in this Letter.
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              <s>For till your further Commands ſhall en­
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              gage me to undertake, by Gods permiſ­
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              ſion, ſuch an Employment, and more lea­
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              ſure ſhall better fit me for it, I know not
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              whether I ſhall be in a condition to try
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              what may be done, to enable me to give
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              you ſome account of the other ſort of
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              Experiments alſo. </s>
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