Vhofpborefcence of Wood, &c. 3 2 1 



the tfreat thicknefs of 2 Feet 4 inches, was difcovered when 

 digging for coal. 



Dr. A. N. Seherer, of Weimar, writes us, that Profeflor 

 Abildgaard, of Copenhagen, has lately obtained from Green- 

 land a foffil, which, on analyfis, is found to contain alumine 

 in combination with the fluoric acid— a mineralogical phe-f 

 nomenon not before met with. 



Sulphat of ftrontian, which has hitherto beenfo fcarce an 

 article in this country, has lately been found in great quan- 

 tities in the neighbourhood of Briftol. It was at. firft be- 

 lieved to be merely a variety of fulphat of barytes, till Mr. 

 William Clayfield, wifliing to obtain fome muriat of barytes, 

 reduced a portion of the mineral in the muriatic acid, when 

 its great fallibility, with its needle-formed cryftals, foon in- 

 dicated the prefence of ftrontian. In the neighbourhood of 

 Ham-green a variety of this rare production is found break- 

 ing through the foil in fuch large mafles that it has been 

 made ufe of in mending the roads. 



PHOSPHOEESCENCE OF WOOD. 



Dr. Carradori, in a paper on the phofphorefcence of wood, 

 aflerts that phofphoric wood acquires by putrefaction the 

 property of attraaing and abforbing light, and of retaining it 

 mechanically. To make it (bine, it is fufficient to expofe it 

 for fome time to the fun. A bit of wood, which the author 

 examined, continued to ftiine under oil for two whole days. 

 In that fituation, fays Dr. Carradori, it was not in contad. 

 with oxygen gas. 



DIURNAL MOTION OF THE EARTH. 



In a work lately publifhed, entitled, De diuturno terra 

 mottt experiment* fhyjict-matbematms confirmato, with 

 ninety copper-plates, the author, Profeflor J. Baptifta 

 Guglielmi, of Bologna, giving an account of feveral ex- 

 periments which he made on the falling of heavy bodies, 

 fays, that, in a height of 241 feet, he found a deviation of 



Vol. III. V H*"» 



