Geology and Mineralogy. 313 
less complicated, it mee impossible, said M. B——, to advance 
further in the region of the marvellous. Nevertheless, essaying 
which ar are ronnie oy the intermediate m aaa 
ut the intensity of these vibrations diminis shes _— rapidly 
with the distance, from which it follows, even in the thei nt 
vibrations ect on ad by the voice, that this plate establishes and 
interrupts successively the communication with a tery. ou 
would be able to have at Z distance another plute which would exe- 
cute at the same time the same mene sg 
ice, and constant at the point of arrival where it is vibrated by 
slactaketiye But it is cemanatrable hae this would not alter the 
sounds, 
‘It is evident from the first that the sounds would reproduce 
themselves with the same pitch in _ scale. — actual condition 
of acoustical science does not permit of saying, @ priori, whether 
the same conditions would we old g sre for 9 asilanios articulated 
by the human voice. e manner in w these syllables are 
produced is not yet mafticiéntly well “apc 
‘In any case it is ‘impossible to ‘demonstrate, in the pr esent 
state of — that the electric transmission of sounds is impossi- 
ble. very probabilit , on the contrary, is for the possibility. 
An ele electric battery, two vibrating plates, and a metallic wire will 
‘It is certain that, at a time more « or less distant, “speech ‘will be 
e 
conomic minerals nny we have hitherto called the Lower 
pena sake of rocks. 
