160 Miscellaneous Intelligence. 
Rossi concludes that these unknown _pertur sseocen re arose from 
microseismic oscillations of the soil. He communicated his views 
to Count Mocenigo, who at once commenced ciperiniaidal in 
t 
ground, at a distance from habitations and from roads. It was 
which the seers had been the mi a © preparatio The 
microphone was afterward transported the observatory on 
Vesuvius, and it was then possible to trace the precise correspond- 
ence between the movements of the seismograph and the sounds 
of the microphone. The above is condensed from G. F. Rodwell, 
omer ee borane which become audible through the microphone 
db 
Thus, they might be produce 
mh) The explosion of bubbles made by the esca ing vapors, 
which in the case of viscid lavas would require considerable inter- 
nal pressure before rupture. 
3) The sudden production or condensation of vapors. 
The more general condition of stress produced in the earth’s 
crust, resulting in more or less yielding along lines of least resis- 
tance, 
The premonitory sounds heard in the microphone ay with 
scp siege nates arent agp class. c. G. B 
