1which I had not before obſerved, to wit, that in the Aſcent of the
Plate out of the water, it draws after it another Plate (if I may ſo
call it) of water, which before it divides and parts from the inferiour
Surface of the Plate of Lead, is raiſed above the Levell of the other
water, more than the thickneſs of the back of a Knife: Then he
goeth to repeat the Experiment with the Ball, and makes me ſee,
that it is but a very ſmall quantity of water, which cleaves to its
compacted and contracted Figure: and then he ſubjoynes, that its
no wonder, if in ſeperating the thinne and broad Plate from the
water, we meet with much greater Reſiſtance, than in ſeperating the
Ball, ſince together with the Plate, we are to raiſe a great quantity of
water, which occurreth not in the Ball: He telleth me moreover,
how that our Queſtion is, whether the Reſiſtance of Elevation be
greater in a dilated Plate of Lead, than in a Ball, and not whether
more reſiſteth a Plate of Lead with a great quantity of water, or a
Ball with a very little water: He ſheweth me in the cloſe, that the
putting the Plate and the Ball firſt into the water, to make proofe
thereby of their Reſiſtance in the Air, is beſides our caſe, which
treats of Elivating in the Air, and of things placed in the Air, and
not of the Reſiſtance that is made in the Confines of the Air and
water, and by things which are part in Air and part in water: and
laſtly, they make me feel with my hand, that when the thinne Plate
is in the Air, and free from the weight of the water, it is raiſed with
the very ſame Force that raiſeth the Ball. Seeing, and
ing theſe things, I know not what to do, unleſs to grant my ſelf
vinced, and to thank ſuch a Friend, for having made me to ſee that
which I never till then obſerved: and, being advertiſed by this ſame
Accident, to tell my Adverſaries, that our Queſtion is, whether a
Board and a Ball of Ebony, equally go to the bottom in water, and
not a Ball of Ebony and a Board of Ebony, joyned with another
flat Body of Air: and, farthermore, that we ſpeak of ſinking, and
not ſinking to the bottom, in water, and not of that which happeneth
in the Confines of the water and Air to Bodies that be part in the
Air, and part in the water; nor much leſs do we treat of the greater
or leſſer Force requiſite in ſeperating this or that Body from the Air;
not omitting to tell them, in the laſt place, that the Air doth reſiſt,
and gravitate downwards in the water, juſt ſo much as the water (if
I may ſo ſpeak) gravitates and reſiſts upwards in the Air, and that the
ſame force is required to ſinke a Bladder under water, that is full of
Air, as to raiſe it in the Air, being full of water, removing the
ſideration of the weight of that Filme or Skinne, and confidering the
water and the Air only. And it is likewiſe true, that the ſame Force
is required to ſink a Cup or ſuch like Veſſell under water, whilſt it is
full of Air, as to raiſe it above the Superficies of the water, keeping
Plate out of the water, it draws after it another Plate (if I may ſo
call it) of water, which before it divides and parts from the inferiour
Surface of the Plate of Lead, is raiſed above the Levell of the other
water, more than the thickneſs of the back of a Knife: Then he
goeth to repeat the Experiment with the Ball, and makes me ſee,
that it is but a very ſmall quantity of water, which cleaves to its
compacted and contracted Figure: and then he ſubjoynes, that its
no wonder, if in ſeperating the thinne and broad Plate from the
water, we meet with much greater Reſiſtance, than in ſeperating the
Ball, ſince together with the Plate, we are to raiſe a great quantity of
water, which occurreth not in the Ball: He telleth me moreover,
how that our Queſtion is, whether the Reſiſtance of Elevation be
greater in a dilated Plate of Lead, than in a Ball, and not whether
more reſiſteth a Plate of Lead with a great quantity of water, or a
Ball with a very little water: He ſheweth me in the cloſe, that the
putting the Plate and the Ball firſt into the water, to make proofe
thereby of their Reſiſtance in the Air, is beſides our caſe, which
treats of Elivating in the Air, and of things placed in the Air, and
not of the Reſiſtance that is made in the Confines of the Air and
water, and by things which are part in Air and part in water: and
laſtly, they make me feel with my hand, that when the thinne Plate
is in the Air, and free from the weight of the water, it is raiſed with
the very ſame Force that raiſeth the Ball. Seeing, and
ing theſe things, I know not what to do, unleſs to grant my ſelf
vinced, and to thank ſuch a Friend, for having made me to ſee that
which I never till then obſerved: and, being advertiſed by this ſame
Accident, to tell my Adverſaries, that our Queſtion is, whether a
Board and a Ball of Ebony, equally go to the bottom in water, and
not a Ball of Ebony and a Board of Ebony, joyned with another
flat Body of Air: and, farthermore, that we ſpeak of ſinking, and
not ſinking to the bottom, in water, and not of that which happeneth
in the Confines of the water and Air to Bodies that be part in the
Air, and part in the water; nor much leſs do we treat of the greater
or leſſer Force requiſite in ſeperating this or that Body from the Air;
not omitting to tell them, in the laſt place, that the Air doth reſiſt,
and gravitate downwards in the water, juſt ſo much as the water (if
I may ſo ſpeak) gravitates and reſiſts upwards in the Air, and that the
ſame force is required to ſinke a Bladder under water, that is full of
Air, as to raiſe it in the Air, being full of water, removing the
ſideration of the weight of that Filme or Skinne, and confidering the
water and the Air only. And it is likewiſe true, that the ſame Force
is required to ſink a Cup or ſuch like Veſſell under water, whilſt it is
full of Air, as to raiſe it above the Superficies of the water, keeping