DE A 
matlon br conjecture which the Teamen make of the place 
where a (hip is, by keeping an account of her way by 
the log, by knowing the courfe they have fleered by tne 
compafs, and by rectifying all, with allowance for drift or 
lee-way; To that this reckoning is without any obferva- 
tion of the fun, moon, and (tars, and is to be rectified as 
often as any good obfervation can be had. 
DEAD-SEA, or Lake Asphaltites, a large lake or 
inland Tea of Paleftine, which contains neither animal or 
vegetable life, no verdure on its banks, or fi(h in its wa¬ 
ters. For the opinions of different authors concerning 
this lake, fee the article Asphaltites, vol. ii. p. *73- 
DEAD'ilAM, a poft-town of the American States, 
and capital of Norfolk county, Maffachufetts, called by 
the aboriginals Tiot, and by the firft fettlers, Clapboard 
Trees. The townfhip was incorporated in 1637, is feven 
miles in length, and fix in breadth, and contains by the 
cenfus 1659 inhabitants.' Its public buildings are three 
congregational churches, an epilcopal church, and a 
court houfe. It is pleafantly (ituated, eleven miles fouth- 
weft of Bofton, on Charles river. A fmall flream fur- 
nifhes water to two griff mills, two faw mills, two ful¬ 
ling mills, and a leather mill, all in the fpace of three 
quarters of a mile, and joins Neponfit river on the bor¬ 
ders of Milton. A wire manufactory is ereCted here, 
for the ufe of the fith-hook and card manufacturers in 
Bofton. 
DEAD'LY, adj. Deftructive ; mortal; murderous: 
Dry mourning will decay more d adly bring. 
As a north wind burns a too forward fpring; 
Give forrow vent, and let the Unices go. Drydert. 
Mortal; implacable.—The Numidians, in number infi¬ 
nite, are deadly enemies unto the Turks. Knollcs. 
DEAD'LY, adv. In a manner refembling the dead : 
Like dumb ftatues, or unbreathing,(tones, 
Star’d each on other, and look’d deadly pale. Skakfp. 
Mortally.—I will break Pharoah’s arms, and he (hall 
groan before him with the groanings of a deadly wounded 
man. Ezek.xxx. 24.—Implacably; irreconcileably ; de- 
ftruCtively. It is fometimes ufed in a ludicrous fenfe, 
only to enforce the fignification of a word.—John had 
got an impreffion, that Lewis was fo deadly cunning a 
man, that he was afraid to venture himfelf alone with 
him. Arbuthnot. 
Mettled fc.hoolboys, fet to cuff, 
Will not confefs that they have done enough, 
Though deadly weary. Orrery. 
DEAD'LY CARROT, f. in botany; fee Thapsia. 
DEAD'LY FEUD,/ in ancient law, a profellion of 
an irreconcileable hatred, till a perfon w r as revenged even 
by the death of his enemy. It is mentioned in 43 Eliz. 
C. 13. And fuch enmity and revenge were allowed by 
the old Saxon laws; for where any man was killed, if a 
pecuniary (atisfacticn was not made to the kindred of 
the (lain, it was lawful for them to take up arms againft 
the murderer, and revenge themfelves on him : and this 
is called deadly 'feud ; which it is conjectured was the 
(Original of an appeal. Blount. 
DEAD'LY NIGHTSHADE, /, fee Atropa. 
DEAD'MAN’s HEAD, or Deadman’s Point, a 
cape of England, on the coaft of Cornwall, in the Eng- 
lifh channel. Lat. 50. 13. N. Ion. 4. 48. W. Greenwich. 
DEAD'MAN’s ISLAND, one of the Magdalen 
iflands. Lat. 47. 22. N. Ion. 61. 30. W. Greenwich. 
DEAD'NESS,/ Frigidity; want of warmth ; want 
of ardour; want of affection.—His grace removes the 
defect of inclination, by taking off our natural dcadnefs 
and difaffeCtion towards them. Rogers. —Weaknefs of the 
vital powers; languor; faintnefs ; inactivity of the fpirits: 
Your gloomy eyes betray a deadnefs. 
And inward languifhing. Dryden. 
Yapidnefs of liquors; lofs of fpirit.— Dcadnefs or flat- 
D E A 627 
nefs in cyder is often occafioned by the too free admiffiou 
of air into the vefiels. Mortimer. 
DEAF, adj. \_docf Dut.] Wanting the fenfe of hear¬ 
ing.—Come on my right hand, for this ear is deaf. Shahf. 
Thus you may (till be young to me, 
While I can better hear than fee : 
Oh, ne’er may fortune (hew her fpite, 
To make me deaf, and mend my light. Swift. 
It has to before the tiling that ought to be heard.—I will 
be deaf to pleading and excufes. Shakefpcare. 
Oh, that men’s ears fliould be 
To ccunfel deaf, but not to flattery! Shakefpcare. 
Deprived of the power of hearing : 
Deaf with the noife, I took my baity flight: 
No mortal courage can fupport the fright. Dryden „ 
Obfcurely heard: 
Nor filence is within, nor voice exprefs, 
But a deaf noife of founds that never ceafe ; 
Confus’d and chiding like the hollow roar 
Of tides receding from.th ? ihfulted (hore. Dryden. 
To DEAF, v. a. To deprive of the power of hearing; 
A fwarnvaf their aerial (liapes appears, 
And, flutt’ring round his temples, deajs his Cars. Dryd. 
DEAF and DUMB, thofe unfortunate people, who 
from a natural defeCt in the organ of hearing, are pre¬ 
cluded the natural ability of learning to fpeak : hence the 
being dumb, is the immediate confequence of being deaf ; 
unlefs in thofe fevveafeswhereindumbnefsarifesfroma de¬ 
feCt in the tongue. The ufe of language is only to be ac¬ 
quired by imitating articulate founds. From this fource 
of intelligence, deaf people feem entirely excluded : tor 
they cannot acquire articulate founds by the ear : unlefs,, 
therefore, articulation be communicated to them by fome 
other medium, thefe unhappy people mult for ever be 
deprived of the ufe of language ; and as language is the 
principal fource of knowledge, whoever has the misfor¬ 
tune to want the fenfe of hearing, mud remain, in a great 
meafure, loft to fociety. Deafnefs has in all ages been 
conlidered as fuch a total obftruCtion to fpeech or writ¬ 
ten language, that an attempt to teach the deaf to fpeak 
or read, was uniformly regarded as impracticable, till 
Dr. Wallis, ana fome others, of late, proved, that although 
deaf people cannot learn to fpeak or read by the direc¬ 
tion of the ear, there are other fources of imitation, by- 
which a fimilar effeCt may be produced. This indeed is 
no eafy talk ; but experience (hews that it is practicable. 
As the eyes, in fome meafure, may ferve deaf perfons 
for ears-, they may underhand what is faid by the motion 
of the lips, tongue, &c. of the fpeakcr ; and even accuf- 
tom themfelves to move their own, as they fee other peo¬ 
ple do, and by this means eventually learn to fpeak. 
Thus it was that Dr. Wallis taught two young gentle¬ 
men, born deaf, to know what was Laid to them, and to 
return pertinent anfwers. Digby gives another inftance 
of the fame, within his own knowledge ; and there was a 
Swifs phyfician at Amfterdam, named John Conrad 
Amman, who efreCfed the fame in feveral children born 
deaf. In the Phil. Tranf. N° 312, we have an account, 
by Mr. Waller, of a man and his filter, each about fifty 
years old, born in the fame town with Mr. Waller, who 
had neither of them the leaft fenfe of hearing ; yet both 
of them knew, by the motion of the lips only, whatever 
was faid to them, and would anfwer pertinently to the 
queftion propofed. It (eems they could both hear and 
(peak when children, but loft their fenfe afterwards : 
whence they retained their fpeech, which, though un¬ 
couth, was yet intelligible. Such another inftance is 
that of Mr. Goddy’s daughter, minifter of St. Gervais 
in Geneva, related by bifhop Burnet. “At two years 
old they perceived fhe had loft her hearing ; and ever 
fince, though (he hears great noifes, yet hears nothing of 
what is faid to her. But by obferving the motions of the 
mouth 
