I s 7 3 3 
-cukaing any uecefiible heights or depths from barometrical obfeivations, p. 571 — 
591 . Eafieit and beft method of determining heights by the barometer, p. 685— 686. 
76 2, 763^ /?. Experiments and obfervations made ia Britain, in order to ob r ain a 
rule for meafuring heights with the barometer^ p. 655. See Barometer. Heights de- 
termined by the barometer, p- 5 1 5 — 532. 539—546. 549,550. 55 ^ — 55+. 59: — 
597. Rule for meafuring foch heights, p. 686, 607. 734, 735. 757,758. 762, 
763, n. The rule which an Avers in middle latitudes will not in the frigid and tor- 
rid zones, p. 742 — 756. Remarks on the error of the rule in the tables of corrpu. 
ration, and a* method- of bringing the theory of the barometer to greater perhd ion, 
P 759 — 77°- Computations of barometrical obfervations on various heights, 
P- 77 d— 787 - 
Hemming , Mr. Experiments with Ids eleflrical cylinder, fome days after ufing ivon the 
bails of Canton’s electrometer, p. 109 — 113. 
Heny, Mr. W illiam, his expei hnents and obfervations in ele£lricity, p. 85. See Elcc- 
tricity . His remarks on fome experiments and obfervations on Mr. Volta’s e’.eflrical 
machine, p. 117, 11S. 
Hilly an account of a volcanic hill near In vernefs, p.383. See. Volcanic Hill. 
Hills, mountains, and various other places, their heights taken by barometrical obfer- 
vations. See Heights. 
Honey-guide, or Cuculus Indicator, a curious fpecies cf cuckow in the interior parts of 
Africa, p. 43. See Cuckow. 
Honey-hunters, how conduced by the honey-guide to the wild bee-hives, p. 44. See 
Cuckow. 
Honig-wyzer , or honey-guide, p. 43. See Cuckow. 
Hovel, a defeription of one on The Mole, one of the Alps, p. 535. 
Huddart, Mr. Jofeph, his account of fome perfons who could not diftinguilh colours, 
p. 260. See Colours. 
Hunter , Dr. and Mr. Henry Vfotfon, their account of Dr. Maty’s illnefs, and of the 
appearances in the dead body, p. 60S — 613. 
Hufoands, a plurality of hulbands allowed among the Thibetians, p. 477. 
HuJJ'arzewJki , a curious portrait of Copernicus in his po/Teffion, p. 33, See. 
I. 
Jackfon , Mr. his new method of foldering the piece of brafs to the back of the little 
fpeculum of a telefcope, p. 346. 
Jamaica , defeription of the Jefuits’ bark-tree of that idand, p.504 — 506. Defeription 
and ufe of the cabbage-bark tree of Jamaica, p. 507 — 312. 
Jefuits Bark Tree of Jamaica and the Caribbees, defeription of it, p. 504 — 506. . 
ignesfatui explained, p. 142. 
inquiries, philofophical ; concerning them, p. 653, 654. 
* Injlru - 
