INDEX. 



Haley, Mr. on the caufes of irregularities 

 in chronometers, 46 



Hand-drill, delcription and drawing of a 

 very economical, 19 



Hardy, Lieut. Col. 181 



Hartnan and Dearn, Meff. their apparatus 

 for filtering water, 333 



Harrifon, Mr. 47 



Hauffman, 237 



Hauy's obfervations on arfeniated copper, 

 187 — 'Count de Bournon's reply to, 

 247 



Hay, utility of adding fait to, 237 



Heat, differences between it and eleftricity, 

 80 — Compound nature of, 90 — Pafles 

 through the particles of fluids, 198 — 

 That from incombuftible b:>dies occa- 

 fions fpontaneous inflammation, 220 — 

 Difference in the radiation of folar and 

 culinary, 297 



Henckel, 232 



Henderfon, Dr. on the change of air by 

 refpiratlon, particularly with regard to 

 the abforption of nitrogen, 40 



Henry, Mr. W. 149 — On Mr Dalton's 

 theory of mixed gafes, 297 



Herfchell, Dr. 72, 214 



H. G. his method of completing the tables 

 of fquares and cubes, 150 



Hidrate of copper, arfeniates of, 191 



Hidrogen, a compound of water and minus 

 eledlricity, 71 — On its nature as de- 

 duced from galvanic experiments, 88— 

 Difappearance of a mixture of it and 

 oxigen over water, 301 



Hidrogenation of metals has different de- 

 grees, 178 



Hippocrates, 77 



Hoffman, 74 



Hope, Dr. 42 



Horace, 108 



Hornblower, Mr. I. C. account of a fad 

 refpedling water heated in a boiler of 

 ftone, 169 



Jforfe-mill of an early date, 37 

 3 



Howard, Mr. 22 



Human figure, defcription and ufe of a te- 

 legraph formed by the, 164 — Mecha- 

 nical additions to, 167 



Humboldt, 42 — Notice of his death, 72 

 — Qupflion refpefting it, 303 



Hulton, Dr. 63 



Hydraulic machine of an early date, de- 

 fcription and drawing of, 35 



Hygrometer of oxide of cobalt, propofed, 



85 



I. 



Jager, 185 



Jars, 289 



Jib, defcription and drawing of one on a 

 new confl:rud:ion, 99 



Inflammations, fpontaneous, caufes of, 217 



Inventions of an earli date which have been 

 fincc brought forward by lacer inven- 

 tors, 35 



Johnfon, B. Efq. obfervations and com- 

 munications refpefting the dry rot in 

 timber, 5 



Jones, Mr, W. his examination of Dr. 

 Wollaflon's experiment on perifcopic 

 fpe(5lacles, 38 



I. R. I. on a galvanic apparatus of large 

 furface, and convertible inta one or more 

 plates, 79— On forne facfta in galvanifm, 

 and on other cbjefts, 84 



Iridium, a new metal found in platina, 



221 



Iron, can yield a blue enamel, 282 — The 

 bad qua'ity of the cold-fhort, probably 

 caufed by the charcoal, 242— Mutual 

 pr-cipitation with copper, 271 



Irwinc, 76 



K. 



Kalm, 62, 101 



Kaftner, 236 



Klapn.th, 127, 142, 187— His analyfet 

 of arfeniated copper, 196 — Chemical 

 examinuion of the ochroites, 207 — On 

 the paftes coloured glcffes, or enamels 

 (f the ancients, 225, 47 



Klein, J. T. 114 



Lskanal, 



