INDEX. 17 



Hetnp (Indian) how ufeful, Vol. I. pref. p. x — obfervatlons on the raifing and 



dreifing it, p. 19S — v.'ind and air injurious to hemp, Z04 — bed method 



of preparing it, 203. 

 Hailopcn (Cape) obfevvations near it on the tranfit of Venus in 1769, Vol. I. 



p. 89, lat. and Ion. of the Cape, 92, 96 — courfcs and diftance between 



the lighthoufe and obfei-vatory there, 93. 

 Henry (Wm.) of Lancafter's defcription of afelf-moving regifter for prefen'ing 



an equal degree of heat. Vol. I. p. 286. 



(Cape) memoir on the fand-hiUs of, Vol. IV. p. 439 — lighthoufe dc- 



fcribed, 442. 



Herrinis, their annii.il pafliige. Vol. II, p. 236. 



the lame in England and America, ib. 



H^lerandra rcnefor?nh, a new plant, defcribed, Vol. IV. p. 173. 

 Hieroglyphics, fuppofed ones on the Ohio, &c. Vol. IV. p. 195. 

 Hig^iiis (J'Jfi) his manner of draining ponds in level grounds. Vol. III. p. 



3-5- 



Hog's lartl di?A\.d.v, a prefervative to grapevines, Vol. I. p. 164. 



/fe/Z/n^jwc/Z/j ('7/<-«r)'y' his method of dellroying wild garlic, Vol, I. p. 241. 



i/w.'tfy paid in tribute to the Mexican fovereigns, Vol. III. p. 245. 



bee, an enquiry if originally a native of America, Vol. III. p. 241 — 



various kinds of, 245. 



Hopliinjon (Francis) his defcription of a new machine for mcafuring a fliip's 

 way, Vol. III. p. 159 — his account of a worm in a horfe's eye, 183 — 

 his improved method of quilling harpfichords, i8j, 190 — his defcrip- 

 tion of a machine ior mcafuring a ihip's way, 239 — his new invented 

 fpring-block defcribed, 331 \_gained tjie Magellannic prize^ — his and Mr. 

 Rittenhoufe's account of the efFefls of lightning on a houfe with con- 

 duftors, 122. 



Horfe's eye, a worm in it. Vol. II. p. I S3 — a living fnake in it, 385. 



H'jrfcs and cattle fattened on fugar, 5cc. Vol. III. p. 75. 



Hofpitah, a machine propofcd for regulating the due temperature of their 

 air. Vol. I. p. 289 — on the conftruflion of, Vol. III. p. 348. 



Hot-houfe, a new way to heat it. Vol. II. p. 74. 



i^oi^fj ftruck with lightning, account of. Vol. III. p. 119, 122 — mode for 

 their greater fecurity fuggcllcd, 125. 



HuJfon's bay, obfervations on thetraiifit of Venus there in 1769, Vol I. ap- 

 pendix p. I . 



Human life in America, on tlie probable duration of, Vol. III. p. 25. 134. 



Humidity of the air in England and France, Vol. 11. p. ^^, 



Hurricane, defcription of a remarkable one in N. England, 1773, Vol.11, 

 p. 136 — conjeiflures as to its caufe and origin, 139. 



J-, theory of, Vol. II. p. 343 — of the fame nature with tornadoes 



and windfpouts, 345. 



common at hike Erie, Vol. III. p. 63. 



Hutchins (Ti^omas) \\\s defcription of a remarkable rock and cafcade near 

 Yougliiogeny river, Pennfylvania, Vol. II. p. 50. 



Hydrargyrus vitriolatus flavus. See Turbilb mineral. 



Hydrogen gas, or inflammable air, proportion of, in the atmofpherf, Vol. IV. 



p. 12S, 



