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

ARTICLE XIII. Experiments concerning the different Cele∣rity of Air produc'd in Vacuo, or in Com∣mon Air.

EXPERIMENT I.

Common Air.

• July 1.0 77.* 1.1 SOwrish Paste being included in a Receiver, In an hour the Mercury was rais'd an Inch; in 7 hours 6 Digits.
• July 11 The height was 11
• July 12 The height was 24
• July 13 The height was 30
• July 14 The height was Sensibly greater.
• July 15 It ascended a little. and was 38 In∣ches high.
• July 19 It yielded no more Air.

Vacuum.

• July 10. 76. A less Quantity being enclos'd in Vacuo, in an hour the Mercury ascended 2 Inches, In 7, it was rais'd to the Top of a short Gage.
• July 19. The Cover was not separated from it's Re∣ceiver; but the Paste being fired by a Burning-Glass, it's Superficies was tinged yellow by the

• Fumes, which after their Ascent fell upon it, so much Air was produc'd, that the Cover was ea∣sily remov'd from the Receiver.

EXPERIMENT II.

Common Air.

• August 20. 76.* 1.2 PASTE 24 hours old, being included with as much Air as rais'd Mercury 4 Digits and ½ above it's usual height. In 6 hours, it was rais'd to 8 Inches.
• Aug. 21 It rose 4 ½
• Aug. 22 It rose 1
• Aug. 23 It rose ½
• Aug. 26 It rose ½
• Aug. 27 It ascended not.
• Aug. 29 It smell'd suba∣cid.

Vacuum.

• Aug. 20. Paste being enclos'd in Vacuo, the Mercury was presently rais'd 2 Inches.
• Aug. 21 It rose 5
• Aug. 22 It rose 3
• Aug. 23 It rose 1
• Aug. 26 It rose 2 in 3 days.
• Aug. 27 It rose 0
• Aug. 28 The Paste was taken out.

Hence it appears, that sometimes Air is more easily produced in Vacuo, than common Air.

EXPERIMENT III.

Vacuum.

• Septemb. 4. 77.* 1.3 FILBERD Kernels were enclos'd in com∣mon Air.
• Sept. 5 The height was 5
• Sept. 6 The height was 10
• Sept. 7 The height was 10
• Sept. 8 The height was 12
• Sept. 9 The height was 15
• Sept. 11 The height was 18
• Sept. 12 It was 23
• Sept. 13 It was 27
• Sept. 14 It was 29
• Sept. 15 It was a little more.
• Sept. 17 It was 30
• Sept. 18. Some Air got out; several Bubbles appearing in the Turpentine, which guarded the Joynts of the Receiver.

Common Air.

• Sept. 4. In the Afternoon the Air seem'd to be dimi∣nished.
• Sept. 5 It was almost ½
• Sept. 6 It was the same
• Sept. 7 It was 1 Inch.
• Sept. 8 No Altera∣tion.
• Sept. 18 No Altera∣tion.

EXPERIMENT IV.

• Septemb. 15. 77. EIGHT Ounces of Raisins of the Sun, bruis'd and diluted with Water, being in∣cluded in a Receiver, large enough to hold 22 Ounces of Water.
• Sept. 16 The height was 6
• Sept. 17 The height was 10
• Sept. 18 The height was 15
• ...Sept. 19
• Sept. 20 It was 29
• Sept. 21 The Receiver forc'd from the Cover.
• Sept. 24. Some Raisins being taken out, the rest were shut up in Vacuo. Sept. 25. The Receiver was sever'd from it's Cover.

• Sept. 15. 77. The same Ingredients being shut up in com∣mon Air.
• Sept. 16 The height was ½
• Sept. 17 The height was 1 ½
• Sept. 18 The height was 3
• Sept. 19 The height was 5
• Sept. 20 The height was 7
• Sept. 21 The height was 9
• Sept. 22 The height was 11
• Sept. 23 The height was 12
• Sept. 24 The height was 15

When the Air broke out, several Bubbles rose from the Raisins: Hence it appears, that Air is more easily generated sometimes in Vacuo, than in common Air.

EXPERIMENT V.

Vacuum.

• Feb. 17.77.* 1.4 THREE Onions being enclos'd in Va∣cuo.
• Feb. 19 The Ascent was 1
• Feb. 21 The Ascent was 1
• Feb. 25 The Ascent was 9
• May 4 They were not al∣ter'd.
• May 18 They were not al∣ter'd.
• Jun. 19 The onions rot∣ten.

Rarified Air.

• Feb. 17. Three Onions were enclos'd in Air, so far ra∣rifi'd, that it sustain'd only 10 Digits of Mer∣cury.
• Feb. 19. The Mercury ascended not. 21. They had acquir'd a Mouldiness. 25. The Mercury as∣cended 7 Digits.
• May 4. No Alteration in the Onions. 18. No Alte∣ration in the Onions, but the Receiver was forced from the Cover.

Common Air.

• Feb. 17. Three Onions were included in a Receiver, not exactly shut.
• Feb. 21. They were not mouldy; but bud∣ded. 25. They shot forth their Roots.

• May 4. They began to be Mouldy.
• This Experiment shews, that some Bodies yield Air as well in rarified Air as in Vacuo. As also that Vegetation is promoted by Air. It is here likewise worth our Notice, that whilst the Onions shot forth, they did not grow Mouldy

Notes

• * 1.1

  Air from sowre Paste.
• * 1.2

  From Paste 24 hours old.
• * 1.3

  From Fil∣berd Ker∣nels.
• * 1.4

  Onions in Vacuo.