[ 608 ] 
D. 
Dtek. Defer iption of two decks, kin in the hold of a fiiip to fwim her independent 
of her own leaky bottom, p.133* 
Dejlanda , Mr. Experiments made by him with water poured upon a quantity of 
glafs in fulion, p. 73. 
Diameter , The apparent diameter of the celeftial bodies defined, p. 341. 
Difeafe, An epidemical, upon draining a meer in the neighbourhood of Rotterdam, 
p. 372. 
Dlfeajes . Account of thofe prevalent at Fort St. George, on the coalt of Coromandel, 
in 1777 and 17 78, p. 269. Some occalioned by the Eaft wind at Senegal, p. 486. 
Qlf order. Some account of a fatal putrid one at Senegambia, p. 478. What fort of a, 
is produced by the poifon of Ticunas, p. 190. General reflexions on thofe corn* 
monly called nervous, p. 205. 
Dung-hill water. Pot-afh extradled from it, p. 350. Ufeful in agriculture, p. 35a* 
Dying, Improvement propofed in dying wool and filk, p. 351* 
E. 
Dels, Experiments on, with the^ poifon of Ticunas, p. 188. Efledls of the water of 
the Lauro-cerafus on, p. 214. 
Elcflricity, An account of fome new experiments in eledlricity, with the defeription 
and ufe of two new eledtrical inftruments, p. 15. Confirmation of Mr-. Ronayne’s 
experiment of the eledlricity of fogs, p. 26. Electricity of fealing-wax, how afledled 
by water, ibid. Water deprives a glafs tube of it, p. 27. Its efledls on a glafs tube 
excited with the amalgamated rubber, and on a flick of fealing-wax rubbed w r ith 
flannel, ibid. The condudting power of the effluvia of burning bodies tried with an 
ifiArument conftrudled for that purpofe, ibid. Fumes, arifing by the adtion of a lens 
from the amalgam of tin-foil and mercury, condudl very badly, p» 29. Expe* 
riment made with a Leyden bottle during an eruption of VefuviuSj p. 59. Its 
effedls in fhortening wires, p. 334. Iron wire refills the paflage of the eledlric fluid 
much more than copper, p. 370. 
Electrometer. The improved atmofpherical, deferibed, p 0 21. Ufes of this Inflrument, 
p. 23. Belt method of Eledtrifying it, p. 24. Howto ufe it in trying the eledlricity 
-of fogs, air, and clouds, p. 25. 
Eleclrophorus, Explanation of an experiment of ProfeflbrLichterfherg with the, p. 1 c;. 
Ellipfe, Some theorems concerning it, applied to the engine for turning ovals, 
p. 380. 
Engine, Properties of that for turning ovals in wood or metal* p, 378, Properties 
of one for drawing ovals upon paper, -p. 378. 
Equation , 
