29. Finding, neither the fruits, nor the height of the mercury, changed PUMATICE any more, I open'd the receiver, and perceiv'd, that the apricocks had kept their colour, very well; but the flesh of them was fpongy, and their tafte inclining to acid. Many bubbles had broke from them, at the time, they were freed from the furrounding preffure.

July 30. 1677. I included the halves of the fruit, juft mention'd, in a Plumbs and a receiver full of common air; and, with them, others of the fame kind, ricocks in com

uncut.

July 31. The mercury had gain'd the height of eight inches.

August 1. At fix a-clock, in the evening, the mercury was twenty-one inches high; but, in the other receiver it remain'd unmov'd.

Auguft 3. They kept their firmnefs much better than thofe included with artificial air. The height of the mercury was thirty-five inches. Auguft 4. The height of the mercury was forty-two inches.

Auguft 6. The whole apricock, feem'd not at all alter'd. The height of the mercury was fifty-feven.

Aug. 72 The height
85 of it, was

The colour of the whole apricock, yesterday,

81

95

Aug. 92
10

97

The height S113
of it, was 2124
began, and now proceeded

to grow yellow. No moifture appear'd.

mon air.

The height S 171

16 of it, was

171

17 and, the days following, it
remain'd at the fame height.

Auguft 27. The height was one hundred and eighty-two.

August 29. When, neither the fruit, nor the height of the mercury changed any more; I open'd the receiver, and found the apricocks of a more acid, and lefs grateful tafte, than the others, in factitious air; tho' their pulp was of a very good colour, but fpungy: they alfo yielded many bubbles, as did the others.

Hence, 'tis probable, that the artificial air of the cherries, greatly hindred the apricocks from producing air; tho' it promotes the alteration of their colour and firmness; and, alfo, ferves to preserve their tafte.

(16.) October 10. 1677. I included an ounce and an half of bruifed, un-Grapes in com ripe grapes, in a receiver, that would hold ten ounces of water; and mos air. drew out no air.

NEUMATICS.

Nov. 6

8

12

27

39

Grapes with

Hirit of wine.

A peach in an

Jan. 6, 1678. The height was 36. The air broke out.

Octob. 10. 1677. I made the fame experiment in another receiver, obferving the fame circumftances; only here I mixed two drams of fpirit of wine with the grapes.

Octob. 11. The mercury was not | Oct. 17. It afcended a little.

18. The height of it was not

yet a quarter of an inch. 19. It was moved but a very little.

Jan. 6. The grapes, during all this time, had produced no air.
Whence it appears, that fpirit of wine hinders fermentation.

(17.) Octob. 17. 1677. I put a peach into an exhaufted receiver, with er, with spirit fome quantity of fpirit of wine, which could not touch the peach, unless

of wine.

Peaches in air

in vapour.

March 27. 1678. I took out the peach, which had kept its colour, but loft its firmnefs. Though the receiver was fmall, yet it was not filled with air; for when open'd, the air feemed to rufh into it: the peach being foftned, was fo depreffed, that the lower part of it touch'd the fpirit of wine; the fuperior part, alfo, had contracted the taste of the fpirit of wine, as well as that which was immerged in it.

(18.) Octob. 17. I included five peaches in an unexhaufted receiver; with Spirit of and with them, fome fpirit of wine, which could not touch the peaches, unless it were elevated in vapour.

wine.

Octob. 17. I included five peaches in a receiver full of common air,

wine, without fpirit of wine.

Octob. 11. The mercury afcended not at all.

Octob. 20. The height of the mercury was five inches.

OFeb;

Jan. 6. 1678. The height was 32.

March 28. 1678. The height was 33.

April 15. The liquor in the lower part of the receiver, had all broke out, and the air followed it; then I took out the peaches.

Hence we learn, that the very vapour of fpirit of wine, fomewhat hinders fermentation; yet much less than the fpirit itself.

(19) April 27. 1678. I included an ounce and a half of pafte, mixed with Pafte with lea leaven, in a receiver full of common air, able to hold twenty-three ounces ven, in common and a half of water.

April 28. The height of the mercury in the gage was two and a half.
April 30. The height of it was three and a quarter.

May 4. The mercury was depreffed, tho' no air broke away, and the paste was mouldy. The height of it was two and a half.

air.

May 6

2

May 17

4

8

ΙΟ

The height 3
of it was

20

24

The height
of it was

14.

2101

IO

July 52
195

The height
of it was 215

S13

leaven, in cons

April 27. 1678. I included an ounce and a half of unleavened pafte, with Pafie, without common air, in a receiver, capable of holding twenty-three ounces and half of water.

a

April 29. Hitherto the mercury had not afcended; but this afternoon it rofe a quarter of an inch.

April 30. There was no change.

May 4. The mercury afcended but very flowly, and the pafte was

May 6. The height of the mercury was four inches.

mon air.

Hence it feems, that leaven rather hinders than forwards the production

of air, if the pafte be not made in a hot place.

(20.) May 23. I included an ounce and a half of unleavened pafte, in a Pafte with spirit receiver capable of holding twenty-five ounces of water, and pour'd fpirit of wine.

of wine

upon it.

May

PNEUMATICS.

Pafte without

27. It was two and a half.

31. There was no change.

10

July 19 No change.

Decemb. 14. When the height of the mercury alter'd no more, I open'd the receiver, and found that the paste had an acid smell.

May 23. I included an ounce and a half of unleavened pafte, in a repirit of wine. ceiver, capable of holding twenty-five ounces of water; but added no fpirit of wine.

New ale inclu

ded in receivers,

June 2

و

19 The mercury a little exceeded thirty inches. This

day the air broke out, and, therefore, I fet the fcrew.

Decemb. 14. The mercury return'd to the height of fifteen inches; when, I open'd the receiver, and found the paste very acid.

Hence it seems to follow, that fpirit of wine greatly obftructs the production of air; and the more, if the pafte be fermented; and that unfermented pafte will, in tract of time, produce no lefs air than that which is fermented.

(21.) Octob. 11. I exactly fill'd a receiver with new ale, fo that no air might be left; and included another quantity of the fame in another receiver, wherein fome fpace was allow'd for the air.

Octob. 12. The cover of that receiver, which contain'd fome air, was broken; and, therefore, I pour'd the fame ale into another receiver, wherein there was room enough left for the air: in the receiver, exactly fill'd, the mercury afcended a little.

was

Octob. 13. In the receiver, exactly fll'd, the height of the mercury twelve inches; in the other, thirteen inches; tho' it had been fhut up a fhorter time, and a much larger space was left, whereinto the air, newly produced, might have been dilated.

Octob. 14. In the full receiver, the height was thirteen; in the other, eighteen. Towards evening, the full receiver work'd the fafteft; for the height of the mercury in it was twenty-two; and in the other buc twenty.

Octob. 15. In the full receiver, the height of the mercury was forty-two; in the other, twenty-fix. And fome bubbles of air, which, in the full receiver, had poffeffed its upper part, wholly va nifh'd; and the ale poffeffed a long space, in the mercurial gage, wherein it was not found before.

October 16. In the full receiver, the height was 60 inches.

In the other 30.

18. In the full receiver, the height was 90.

In the other 40.

22. In the full receiver, the height was 90.
In the other 42.

23. In the full receiver, the height was 108.
In the other 50.

26. In the full receiver, the height was 108.
In the other 60.

28. In the full receiver, the height was 133.
In the other 63.

.

The bubbles appear'd again, yet nothing flowed out.

Nov. 8. The full receiver loft much of its liquor; wherefore, I opened it; when, all the ale feem'd as if it would have vanifh'd into froth, unless I had fuddenly ftopp'd the little hole, that gave it vent. I many times tried, that, if the hole were opened in the gage, the mercury would prefently defcend; but, if the hole were again ftopp'd, it would fpeedily afcend. The ale had a moft pungent tafte.

Nov. 9. I opened the other receiver, and obferved almoft the fame things.

Hence it feems to follow, that ale, if the air be wholly excluded from the containing veffel, will ferment more flowly, than if fome air be left therein; and that, in time, it makes a greater compreffion, if no room be left for its dilatation.

PNEUMATICS.

an exhaufted re

(22.) June 27. I put green peafe into an exhaufted receiver, with fpirit Pease, with Spiof wine. Towards the evening, the receiver feem'd to admit the external rit of wine, in air, and the mercury rofe to the height of eighteen inches, when I clofed ceiver. the cover with turpentine.

June 30. I perceived no more change in the height of the mercury.
July 7. No air was produced, even in the most vehement heat.

put other pease into an exhaufted receiver, without fpirit of Peafe without

June 27. I put

wine. The receiver, and the quantity of the peafe, were the fame as the laft experiment.

in

June 18. The receiver was full of air; tho', I think, it was not exactly fhut; and, therefore, I again included the fame peafe. Towards evening, the height of the mercury was five inches.

June 29

{{36

S26

(10 July 5 The height of it was 30

16

30 The height of it was

Fuly

I

(19

July 8. The air got out of the, receiver.

Hence it appears, that fpirit of wine hinders the production of air

pease.

in

Spirit of wine, an exhausted in

receiver.

(23) June 9. 1677. I put cherries into an exhaufted receiver, and in fix That the effects hours time the mercury came to the height of five inches and a half.

VOL. II.

Eeee

of artificial air differ from thofe of the common Shewn in cher

June ries.