\ 
DIS5 
century. According ° fae the ground-work of all difcant 
was the plain chant ; n his treatife of the education of 
children for the choir a hae Dame, he enjoins a particular 
attention to chanting, earl in and difcant, as the three 
moft effential branches of their fludy. 
Difcant, by the Italians, is called contrappunto alla mente, 
or extemporaneous harmony. Padre Martini, ‘* faggio di 
contrappunto,”” heard this kind of harmony, a quattro vocl, 
in four parts, produced in great perfe€tion in the church of 
of ear int 
not anaysf eafily ace as in m see ver, 
there are muficians in the church fo eal Bee in this kind 
of ing that they lead off, and even carry on, fugues ex- 
when the fubje& will allow it, without Boe aaa 
or encroaching le the other parts, or committing a fingle 
fault in the harmon 
DISCEIT, in our Old Writers. 
CEPTIONE. 
mre fo wel 
See Deceit and De- 
I, in Ancient Geography, a people inhabiting 
the interior of Africa, faid by Phny to have been fubdued 
by-Cornelius Balbus 
DISCE RNING, an act of the mind, whereby it diftin- 
guifhes between i 
a this re re a difcerning depend the evidence and 
certainty of feveral, ee era propolitions which pals 
or innate truths ; which in reality flow fro 
eee a bag a i mind, ee eby it pereeives two 
jdcas to be the fame, or to be dea. 
a a able nicely to difinguifh one thing from an- 
other, where there is the lez ft difference, con fift in great 
clearnefs of 
which are quite oppefite to wit: this confifts moft in the af-. 
femblage of ideas, and putting thofe together with quick- 
nefg and variety, which have the leaft refemblance to form 
8: whe 
‘confu fion, or miftake about them, though the fenfes fhould 
convey them from the fame objeQ differently on different 
ecafions. See JuDGMENT. 
DISCEUS, or Discirormis Cometa. See Discus, 
DISCHARGE, in Eiedricity. See et ARG 
DiscHarGE, in Law, on writs and 
; &c.is, where 
ay 
= 
=~ 
oO 
gS 
2 
be arrefted by d the plaintiff do 
not file a declaration againft the inion in prifon in 
two terms, he fhall be difcharged on common bail. (1 Lil. 
Abr. o.) Alfo where a defendant on arreft is ad- 
mitted to bail, if the bail bring in the principal before the 
return of the fecond feire facias, flued out againft them, 
they fhall be difcharged. If an obligee difcharges one joint 
obligor when feveral are aed bound, it difcharges the 
others. (Merch. 129. nd aman may difcharge a pro- 
mife made to himfelf, &c. (Cro. Jac. 483: ) See Acguit- 
TAL, aes T1aBEas 
Isc z, in Feige pen ne is the difmiffion of a 
mee from ee mpany to which he belonged, 
Aither by his own ts or when after long and faiths 
DIS 
ful = he is entitled to his majeRy’s bounty. See 
ISMISS 
Discu ae oe in Sea Language, ee to unload a 
fhip, or take out her ftores, ammunition, artillery, &c. 
When applied s ae crew, it implies to di ‘band them from 
immediate fervic 
tegen GE of Phd through apertures, orifices, &c. 
The various important particulars which demand attentive 
eoalideGhn relative to the difcharge of fluids through 
apertures made in the fides of veffels in which thofe fluids are 
contained ; are the quantity of fluid difcherged in a given 
je& have induced the greateft p 
of the laft wo, to exer rt "themes in es ine 
la our 
rs fo very near the truth, as to differ from it by at 
In this fubject, the determina- 
tions of the theoretical propofitions do not in general (abe 
with the refults of a€tual experiments; not on account o 
defeGtive demonttration, but becaufe the demonftrations can- 
not ies eftabli 
wn or cannot 
Thof fe circum ftances are tne peculiar qualities of fluids, which 
vary according to homogeneity, purity, temperature, &c ; 
the attraction of aggregation, or pr gaan attre@ion, 
which differs confiderably in water, oil, mercury, &c3 the 
fri@tion againfk the fides of the veffels , the refiftance of the 
air; the fize of the veffel in proportion to the aperture 
through wage the fluid iffues; the fha - ce os Be aaa 
the different direGtions in which the r (as 
they are otherwile calle ¢) the various uf lament of ae fluid 
the and th 
caer: it 
muft be acknowledged, that the conftant attention which is 
paid to the refults of experiments renders the theory daily 
more extended and more precife, 
For the fake of ee ae we fhall feparate the theo- 
na ina teufive manner, en account of the 
nol ufeful experimental inveftigations, whenc ad 
mzy be enabled to adopt the moft ufeful practical dedutions, 
without his being perplexed by intricate, and in moft 
infufficient calculations. 
Propofition I. When water, or other non-elaftic fluid, 
runs through a pipe or tube of an uniform fhape; equa al 
quantities of it pafs through every parailel {Aion of the 
tube ; viz. the water runs with equal velocity through every 
one of thofe fe ions. 
This is fo very evident ee that the = Laypel 
of fluid muft pafs thre ugh the e {Giow 
time, a3 to require no farther illuftration ; ; Sit ta 
cafes 
ame 
uf be 
odferved, 
