Miscellaneous Intelligence. 291 
_ Pen Telegraph.—When Prof. Morse’s telegraph was first essayed 
in this city, it recorded the signs upon a moving fillet of paper by 
means of a pen charged with ink, the pen being supplied from a reser- 
a 
ture be- 
comes rapidly peroxydized from its porosity and from the spontaneously 
elevated temperature of the mass. 
a 
Carbonate of lime. When no more oxyd of iron and chlorid of cal- 
cium remain undecomposed, the mixture is expose 
