'The EfeBs of continued. Heat. 417inches long, and I placed it in the sand fur-nace on the 11 th of August, and on the23d of the same month I found much ofthe gold precipitated, and adhering to thesides of the glass in the form of slendercrystals, very beautiful. On the 30th ofSeptember, I observed no difference in thecrystals, but found some gold precipitatedin irregular masses, of a darkisli colour,quite distinct from the crystals; and thusit remained till the 19th of January follow-ing, when I discontinued the process. Boththe crystals and the gold still continue notre-diffolved.

I shall now just mention my observationson some other substances exposed to thesame heat, though they have nothing inthem that will be thought of any conse-quence i except that it may be proper to beknown that the experiments have beenmade, and that no remarkable appearancefollowed.

S pint of nvine in large tubes underwentno alteration, nor did it affect the glass inthe least; but another quantity confined inE e a short