INDEX. 
553 
with foap and w^ter, ibid. Experiments made thereon, p. 91—93. Only of ufe in 
dying filk and wool, p. 93. No colours dye fo fpeedlly, and few go farther, ibid. 
Of the relinous kind, and of affinity with annotta, ibid. 
Concretions, vulcanic, difeovered in the Venetian State in Italy, p. 5. Stt Bafaltes. 
Conjldlations, influences aferibed to them by the ancients, p. 184. Whence the opinion 
of their influence arofe, ibid. Why it does not now prevail equally with the opinion 
of the moon’s influence, ibid. 
Cooper, Dr. W. his account of an extraordinaiy acephalous birth, p. 311. Birth, 
Cornijh, Mr. James, his account of the torpidity of fwallows and martins, p. 343 — 352. 
See Torpidity. 
CoJJivo, vulcanic hills in the neighbourhoood of, p. 34. 
Crater. No infiance of a Crater in any bafaltine bill, p. 2r. 
Curve. Elafiic curve, and Curve of Equable recefs, both confiru\fi:ed by the rediifica* 
tion of the Ellipfis, p. 289. 
D. 
Barvoen, in Lancafliire, furvey of its inhabitants in the year 1773, with the ftate of births 
and deaths, p. 431, n. 
Deaths, proportion of to marriages in different places and at different periods, p. 328, 329. 
See Life, 
Derham, Mr. his calculation of the proportion of male to female births, p. 332. 434. 
His calculation confirmed, p. 333. 4.3^. 
Diavolo, il monte del, a bafaltine hill in the Venetian State, p. 6. A topogra- 
phical view of it. Tab. 2. Situation of this caufew'ay, p. 24. The bafaltine co- 
lumns of il monte del Diavolo, bedded in vulcanic fand, p. 1 2. See Bafaltes, Hills 
Vukanie. 
Diequemare, Abbe, his fecond effay on the natural hifiory of the fea anemonies, p. 207. 
See Sea Anemonies. 
Dipping-Needle, defeription of a new one, p. 79. Dipping-needles ill calculated, and a 
new one contrived, p. 80. Delcrlption of it, p. 80, 8r. Its ufe and management, p. 81, 
82. Dipping-needles, to be of ufe at fea, how to be placed, p. 82. Method of fettlng 
them at fea inaccurate and untrue, p. 82, 83. A confiant power in this infirumentof 
fetting itfelf in the proper polition, of keeping in it, or of refioring itfelf to it in cafe 
it has loft it, p. 83. By its double motion, counterafts the rolling of the veffel, ibid. 
Method of examining the obfervations, ibid. A fmall difference occafioned by it, 
p. 84. Queries concerning this variation, ibid. - — Dipping-needle, experiments 
on the, p. 129. Obfervations at Stromnefs, in the ifles of Orkney, p. 130, 13 1. In 
Hudfon’s bay, p. 132 — 136. 
Dolfon, Dr. his experiments in an heated room, p. 463. 
Dormice, frequently found in afiate of torpidity, p. 346. Experiments on their power 
of reflfting external cold, p. 448, 449. 
Dqfi 
4 D 2 
