G^VLVANIC DEKLAGZvAXIONS. 97 



I did not try the. vapour of burning fulphur, but all the 

 world knows that it whitens wool well, and that the woollen 

 manufadurers ufe it to give the finiftiing degree of whitenefs 

 to their goods. Of all the methods which I tried, I found 

 none better for bleaching the wool, than expofing it, on the 

 grafs, to the dew and the fun, after being well fcoured with 

 weak foap-fuds : the yellow fpots o~f that from the groin, how- 

 ever, were not entirely deftroyed j they had only diminilhed 

 in intenfity. 



xr. 



Copy of a Letter from Mr, Cuthbertson to Dr. Pearson, 



communicating an important and curious diftinguifhing PrO' 

 perty between the Galvanic and EleSiric fluids. Communicated 

 bj/ Dr. Pearson, 



To Dr. PEARSON; 

 Dear Sir, 



1 THINK it right to inform you, that yeflerday evening I Galvanic defla- 

 refumed the experiments with the galvanic batteries ; the re- 8"tion». 

 fult was — 



1. Charcoal was deflagrated and ignited for about one inch 

 in length. 



2. Iron wire ~ inch diameter, was melted into a ball .-^ 

 inch diameter. 



3. Platina wire fis i"ch dianieter, was melted into a ball 

 Yo inch diameter. 



4. Brafs wire ~ inch diameter, ^ inch in length was ig- 

 nited. 



5. Ditto xz '"^'^ diameter, was red-hot at the extremity. 



6. Iron wire -j-f^ inch diameter, was red-hot for 16 inches 

 in length. 



7. Ditto 12 Inches, deflagrated and melted into a ball, 



8. Ditto fix inches in length, were deflagrated, 



9. Ditto 8 inches in length, were ignited. 



Two troughs, each trough containing 30 pair of plates fix 

 inches fquare, were ufed for the firft feven experiments, and 

 4)ne of thefe troughs only for the two laft expeciments. 



Vol. VIIL— June, 1804, H The 



