Fusion of ee 345 
be distinguished by | tea eye from portions of dina; In 
different repetitions of the experiment with the lumbago 
points, there were some varieties in the results. isiems “ene 
stance only, was. there a globule formed on the point; 
would seem as if the melted spheres of plumbago as soon as 
formed, rolled out of the current of flame, and congealed on 
the contiguous parts. In every instance, the plumbago on the 
_ copper side, was hollowed out, into a spherical cavity, and 
the corresponding peice on the zinc side, received an accu- 
mulation more or less considerable. In most instances and 
in all when the Deflagrator was very active, besides the glo- 
wre of —_ matter, a distinct tuft or projection was form- 
¢ pole, considerably resembling the melted 
ehineoul: deseribed 3 in my former communications, but ap- 
parently denser and more compact; although resembling 
the melted charcoal, as one variety of volcanic slag resem- 
bles another, it could be easily distinguished by an eye fa- 
miliarized to the appearances. In one experiment the cav- 
ity, and all the parts of the plumbago at the copper pole 
were completely melted on the surface, and covered with a 
black enamel. The appearances were somewhat varied 
when specimens of plumbago from different localities were 
used. In some instances it burnt, and even deflagrated, 
being ciessians dissipated in brilliant scintillations ; the 
substance was rapidly consumed and no fusion was sbéiined. 
This kind of effect shoueied most distinctly when there was 
a plumbago piece on the copper side, and a piece of char- 
coal on the zine side. I have already mentioned the cu- 
rious result which is obtained when this arrangement is re- 
versed, the charcoal on the copper, and the plumbago on 
the zinc side; this effect was now particularly distinct and 
remarkable, the charcoal on the copper side was rapidly vol- 
atilized, a deep cavity was formed, and the charcoal taken 
rom it, was instantly accumulated upon the plumbago point, 
forming a most beautiful protuberance, completely distin- 
guishable from the plumbago, and presenting when “ate 
by the microscope, a congeries of aggregated spheres, w 
Bs mark of ey fusion and i: a ‘perfect metallic hase 
tr. VI— 
