D Y S 
Kories of middling ftrength. For this purpofe, four 
horfiss of middle lize, in good health and well-condi¬ 
tioned, were fubje< 5 Ied feparately and in fucceflion to the 
fame trial. The fitft drew equivalent to thirty-fix myria- 
gramines ; the fecond thirty-eight and an half; the third 
twenty-fix and an half; and the fourth forty-three. The 
fum of all thefe is 144 rnyriagrammes ; and if we take 
the mean of this fum, we fhall have, for the ftrength of 
ordinary horfes, thirty-fix rnyriagrammes, or 736 pounds 
dt marc. 
DYNAS'TICAL, adj. Relative to mode of govern¬ 
ment.—The Hiftory and Antiquities of Harwich and Do- 
ver-conrt, topographical, dynajlical , and political. Title 
to Dale's Harwich. 
DY'NASTY,/i [ouvacrUix of bwodlvv, Gr. to be power¬ 
ful, or king.] A race or fucceflion of kings of the fame 
line or family. Such were the dynafties of Egypt, of 
China, &c. 
DYNDYME'NE, in heathen mythology, one of the 
names of the goddefs Vefta. 
DY'NISH, a fmall inland in the Atlantic, near the weft 
coaft of Ireland, and county of Gahvay. Lat. 53. 1 6. N. 
Ion. 9. 44. W. Greenwich. 
DYP'TYCHA, f. [Gr.] A kind of public regifter 
among the ancients. 
DYR'NITZ, or Tyrnitz, a town of Germany, in 
the archduchy of Auftria : feventeen miles fouth of St. 
Polten. 
DYRRA'CHIUM, anciently a town on the coaft of 
Illyricum, before called Epidamnum, or Epidavinvs ; origi¬ 
nally built by the Corcyreans. A Roman colony. Pliny. 
DY'SAE,/! Inferior goddefles among the Saxons, being 
the meflengers of the great Woden, whofe province it was 
to convey the fouls of fucli as died in battle to his abode, 
calle^ Valkali, i. e. the hall of (laughter. 
DYSAESTHE'SIA, f. [from 3 vs, Gr. difficulty, and 
ecio- 0 avo(xai, to feel or perceive.] A dulnefs of fenfation, 
or difeale called a faulty fenfe, from fume defect of the 
external organs. 
DY'SART, a town of Scotland, in the county of Fife, 
with a fmall harbour on the north fide of the Frith of 
Forth ; the principal trade is in coals: eleven miles north 
of Edinburgh. Lat. 56. 7. N. Ion. 3. 8. W. Greenwich. 
DY-SCINE'SI A,y. [from ovc, Gr. and y.meco, to move. ] 
A difficulty of motion. Alio a defeat of fome of the 
limbs. 
DYSCOPHO'SISjyi [from $v(, Gr. with difficulty, and 
xoCca, to be deaf.] A defect in the fenfe of hearing. 
DYSECG£'A,yi [from hjs, Gr. with difficulty, and 
tooew, to hear.] The medical term for deufnefs. 
DYS'CRAS Y, f. [from hoc,, Gr. difficulty, and y.epa-v- 
to mix.] An unequal mixture of elements in the 
blood or nervous juices ; a diftemperaturg, when fome 
bad humour or quality abounds in the body.—In this 
pituitous dyfcrafy of blood, we muft vomit oft'the pitui- 
4 a, and purge upon intermi(lions. Floyer. 
DYSEN' TERIC, adj. Belonging to a dyfentery, tend¬ 
ing to a dyfentery, attended with a dyfentery. 
DYSEN' TER Y ,f. [dyfenterie, Fr. from Gr.] 
A loofenefs or flux of the bowels. See the article Me¬ 
dicine. —From an unufual inconftancy of the weather, 
and perpetual changes of the wind from eaft to weft, pro¬ 
ceed epidemical dyfenlerics. Arbuthnot. 
DYSLO'CHIA, f. [from 3 vs, Gt>. difficultly, and Xo- 
yix, the lochia.] A morbid fuppreflion of the lochia, or 
menftrual difcharge. 
DYS'NOM Y, J. [from S'vc, Gr. bad, and a law.] 
The aft of conftituting bad laws'. 
DYSG'DES,/. [front 3 vc, Gr. bad, and of«, to fmell.] 
The difeafe called a foetid or finking breath. Fcefius fays, 
that in Hippocrates we are to underftand by this word, 
a fetid diforder of the fmall inteftines. Dr. Percival 
calls it dyjodes pulmmiica, to which, he fays, perCbns with 
a narrow chert and fcorbutic habit are peculia, ly incident. 
He obferves, that it feems to originate from a want of 
D Y T 171 
power to make- a full expiration, by which too much 
perfpirable matter is retained, and corrupted by ftagna- 
tion in the veficles of the lungs. In fuch cafes be hath 
found the moft falutary effects from the life of myrrh and 
fixed air, internally adminiftered. Thefe antifeptic fub« 
fiances are probably carried to the lungs, and difcharged 
together with the offenfive vapour, which correct, at the 
fame time that they invigorate, the fmalleft ramifications 
of the bronchia?. 
DYSO'PIA,y [from Svc,, Gr. difficultly, and o7rrof4«», 
to fee.] An indiftinfl and difficult vifion, occafloned by 
fome natural or acquired defeCt in the eye. We are told 0 
in vol. iv. of the Memoirs of the Medical Society of Lon¬ 
don, 1795, that this complaint is known in Ruflia by a 
name (ignifying hen blindnefs. The patient lofes his fight at 
fun-fet, and does not recover it till fun-rife ; and is blind 
even during the lighted nights of fummer. The difeafe 
is chiefly among the peafants during the hay-harveft, 
when they generally work all night, to avoid the fultry 
heat of day, and when they lleep lefs than ufual. M, 
Guthrie, M. D. at Peterfburgh, attributes the caufe to 
an exhauftion of the irritability of tire retina, by excefs 
of light. This temporary amaurofis goes off fpontane- 
oufly ; but they ufe a decoction of blue-bottle, centaurea, 
cyanus, Lin. 
DYSOREX'I A, f. [from $v;, Gr. bad, and ap. 
petite.] A bad or depraved appetite ; a loathing of food. 
DYSPEP'SI A, f. [from 3 vs, Gr. difficultly, and irow- 
tb, to concoCt.] A difficulty ofidigeftion ; a weaknefs of 
the digeftive organs. 
DYSPERMATIS'MUS,/ [from 0 V, Gr. difficultly, 
and cnrspy.a ra, to procreate.] An inability to beget chil¬ 
dren ; an infirmity of the procreative members. 
DYSPHO'NI A,y. [from 3 vs, Gr. difficultly, and (peon j, 
the voice.] An impeded voice; a difficulty of fpeecli; 
a defect of utterance. 
DYSPNCE'A, [from 3 vs, Gr. difficultly, and 
to breathe.] A difficulty of breathing; an impeded re- 
fpiration ; a ftate of afthnra. 
DYSTHY'MIA, [from Sue, Gr. bad, and Svuos, the 
mind.] Infanity ; a diforder of the mind; a ltate of 
phrenzy. 
DYSTI'CLII A, f. [from 3 W, Gr. and s-iya.', a row.] 
A double row of hairs on tha eyelids. 
DYSTO'CHIA, [from Gr. difficultly, and r<x- 
t 10, to bring forth.] A difficulty of parturition ; a linger¬ 
ing and unnatural labour. 
DYSTRYACHl'ASIS, f. [Gr.] A continued de¬ 
fluxion of tears occalioned by the lhort points of the 
hairs growing under the eyelids. 
DY'SURY, f. \_dyfuria , Lat. from 3 vc, G r. painful, 
and l’[ov, urine.] A difficulty of voiding the urine, com¬ 
monly called frangury. For the caufe and cure, fee the 
article Medicine. 
DYTIS'CLS, f. the water-beetle; in entomology, a 
genus of infeCts belonging to the order of coleoptera ; 
the antennas are fienderand Cetaceous ; they have fix fili¬ 
form palpi or feelers ; the hind feet are hairy, and formed 
for fwimming ; and are alfo furnilhed with claws; the 
under fide of the fore feet of the males is hemifpherical ; 
the elytra of the female are moftly furrowed. Prom the 
indefatigable refearch of modern entoinologifts, no lefs 
than one hundred and forty-feven fpecies are now afeer- 
tained, diftinguifhed chiefly by their antennae, the colour 
of the elytra, &c. The larvae of the dytifeus are oftea 
met with in water. They are oblong, and have fix fcaly 
feet. Their body confifts of eleven fegments. The head 
is large, with four filiform antennas and a ftrong pair of 
jaws. The laft fegments of their body have rows of hairs 
on the fides; and the abdomen is terminated by two 
fpines charged with the like hairs, forming a kind of 
plumes. Thefe larvae are frequently of a greenilh varie¬ 
gated brown : they are lively, aCtive, and extremely vo¬ 
racious : they devour and feed upon other water-infeCts, 
and often tear and deftroy each other. The perfeCl in- 
f«a 
