xti O O N T E N T SI 



DECEMBER 1798. 



■^Engravings of the following Objects: i. A View of the Manfion of Rofea- 

 penna, in Ireland, deftroyed in Confequence of the Change of Climate fup- 

 pofed to have taken Place' in that liland during theprefent Century. 2. 

 The powerful Ele£trical Machine of Rouland, which operates by the 



; Friftion of Silk. 



J, Memoir on the GHmate of Ireland. By the Rev. William Hamilton, of 



f Favet, in the County of Donegal ; late FelloAv of Trinity College, Dublin ; 



M.R.I. A. Correfponding Member of the Royal Society of Edinburgh, 



&c. — — — — — — p. 381 



General opinion that the feafons of Ireland are confiderably changed within the memory of man ; 

 that the winters are milder, and the fummers lefs warm. Meteorological inftruments do not ex- 

 hibit all the circumflances which influence a climate. Recourfe muft be had to other obferva- 

 tions. The winds of Ireland have, of late years, blown with uncommon violence from the weft- 

 ward. Their effefts are particularly marked on the province of Uifler. Interefting fafts re- 

 fpefting trees which formerly flourifhed in Ireland, but cannot now withftand the rigour of the 

 feafons. The lands of the fea have been driven with increafed violence on the Irifh coaft. Iii- 

 flances of the fpeedy deflruftion of habitable places and diftriils from this caufe in the Corpora- 

 tion of Bannow, the Manfion of Rofeapenna, and other deferted habitations. Increafing violence 

 of the tides from the Atlantic Ocean. 



II. Analyfis of the Red Lead of Siberia ; with Experiments on the New 

 Metal it contains. By Citizen Vauquelin, lnfpe£tor of Ores, and Con- 

 fervator of Chemical Produ£l:s at the Mineralogical School — p. 387 



Hiftory of the Siberian Red Lead Ore, and the experiments formerly made upon it. New analyfis. 

 I. By boiling with carbonate of potafti, which precipitated carbonate of lead, and formed a 

 neutral fait with the peculiar acid of the ore. Nitric acid deprived this fait of its alkali, which 

 cryflallizes by fpontaneous evaporation. — Or otherwife, s. diluted muriatic acid being added to 

 the ore, combined with the lead of the ore, and difengaged the acid. The muriate of lead 

 being infoluble, remained at the bottom, while the peculiar acid of the ore became fufpended, 

 together with a fmall redundant portion of marine acid. This laft, after decantation, was ab- 

 flrafted by adding fmall portions of the oxyde of filver, and left a folution of the acid of 

 chrome. Its nature, properties, and combinations. 



III. Information refpefting the Earth of the Beryl ; in Continuation of the 

 firft Memoir on the fame Subjeft. By Citizen Vauquelin — p. 393 



Additional Experiments by which the component parts of beryl, and the charafteriftic properties of 

 the new earth difcovered in that ftone, are more correftly afcertained. 



IV. Obfervations on Eleftncity, Light, and Caloric ; chiefly direifted to the 

 Kefults of Dr. Pearfon's Experiments on Eleftric Difcharges through 

 Water. By a Correfpondent — — — p. 396 



Remarks on the very Joofe and inaccurate notions of philofophers concerning eleftricity, light, and 

 caloric. Animadverfions on Dr. Pearfon's theory of the decompofition and re-produftion of 

 water by eJeftricity. On the, materiality of heat. 



V.An 



