Geology and Mineralogy. 813 
still the effects were faintly audible. Here the galvanometer, 
which was still in circuit, hardly gave any indication. 
In these experiments only one telephone is used, viz: at the 
i ith a powerful current 
and short dashes of the Morse alphabet. 
_ I ought to mention that I believe the 
as Prof. Tait. 
Grorce Forses, Andersonian College, Glasgow, February 13. 
—From Nature of Feb. 28. 
Il GroLtogy AND MINERALOGY. 
l. Origin of the Driftless Region of the Northwest; by 
np D. Irvinc.—In a notice of vol. ii of the Geology of 
the explanation 
I have offered for the existence of the riftless region of Wiscon- 
Report for 1876. I am informed, also, that 
ritten for a Chicago journal 
Page which’ I have not myself seen —has said that my explana- 
on i i in- 
worth, they are wholly my own. Possibly they are wo 
more because analogous to those reached independently by some 
