Quintus & Sextus De Varik SeleBk, Auth Honor. Fabry , 
^' J(ff^f Lugduni Galliarum, 1669. in8*. 
THis Learned Jefuk in thofe Dialogftes writcth againfl- Gri- 
^aldi^ Alphonfus BoreVi^ and Montanari ^ who in divers . 
things differ from what he hath written : Againft the firfi^cont 
tQttnng Light ^ and that great controverted point , Whether it > 
keaBodji And whether K^^eff /^»5 and RefraSijnn prove itxo 
be fuch? C^c^ Againft ihefecond he writeth, about Motion md^ 
Tercnffion^ where many things are difcuffed^ as. Whether 
motion be produced^ or traduced? Whether the impetus of the 
leaft Body may move the greateft Body? Whether the Force 
of be a certain aftion of GomprefGon in the Impel- 
lent Body ? What are the Laws of two Projecled Bodies^ equal, 
or unequal, of equal, or unequal velocity? Whether the 
Times of the Vibrations of different Pef^duln/^s are in afub-» 
duplicate proporcioD of their Lengths ? Whether a Body im-, 
pelledj being reflefted by a Springy and Compreffed Body, re- 
fer ing it felf^ be moved and carried back with that Iwpetnsi 
only^ which it received from the fam^? Whether a Body H^?- 
rg2s^?;2/^//^ projefted will at the fame time come to the ground, 
as if it bad of it felf fallen down rerpendicuUrly Why Bricks 
are broken by the percuffions of an Hammer , though they rcr 
main whole under the weight of a vaft and bulky Body ? And 
why an Hatchet cleaveth Wood, whereas a very heavy weight 
laid on an Hatchet fixed in Woodjdoth not ? What is the Prin-r 
ciple of the Motion of ReftkutioD ? And many more. Againft 
the third hQ writeth , about the Afcent of Liquors in JJenden 
Tubes to wit, whether thdt Rifing proceeds from the Gravi- 
ifcation of the Air , or from its ComprelBon only , prefcinded 
from Its weight? Whether Liquors do rile, equally high ^ in 
longer and ft orter Tubes, but of equal bore ? 
Th^TwM lafi Dialogues contain Mifcdlanies : As^of the/^*. 
innate in Bodies , affigned them. by Nature to attain their 
jrelpeftive Ends, of the Gravitation of the Air and its pref- 
fure downwardsj to make Vapors afcend^ of the .Variety of 
Motion in Heavier and Lighter Balls moved on Longer or 
Shorter, thicker or flenderer, firings 5 of new MechanicalPow- 
eirs s of an Hypothefis for Iblving the Vhsmmena of the T^^ex 
% the Prefliire of the Atmofpheie^ importing, that the Xydes 
