152 Scientific Intelligence. 
been aR ate But this formula contains two terms, of which 
s proportional to the velocity of the medium, but is very 
small, adi slight changes in it are quite inappreciable. The prin- 
cipal term, on the other hand, seems to depend only on the apparent 
period of the incident light, and is therefore laine of the 
motion. By applying a modification of the method of the inter- 
ference of plates it appears that there is not a ‘lacus of -000005, 
or of *000002, using the method of Newton’s rings. The negative 
ae of M. ‘Hock on the interference of light passing through a 
refracting medium with or against the motion of the earth is 
similarly sapiaiensl Again, by the double scare of Iceland 
spar, fringes were o tained differi ring by 50, or even 100,000 
wave lengths, sfithout a variation of canes in their apparent 
position. With the rotary polarization of quartz with an imstru- 
ment capable of detecting a change of plane of quarter re a pie ee 
and a rotation of fifteen circumferences, not the least change was 
Ps Om, Seieh due to the motion of the earth.—Jour. de ee ys 
on New source of — —M. Donato Tommasi nei that 
when a current of steam under a pressure of five or six’ atmos- 
pheres is passed thro cag a tube of copper two or three millimeters 
in diameter, and rolled in a helix around a cylinder of iron, the 
latter is so ‘strongly magnetized that an iron needle place some 
magnetized as long as the steam passes through the 
Comptes Rendus, \xxx, 1007. E. ©. P. 
II. GroLogy anp Naturat Hrsrory. 
1. The Geology of New Mexico.—Prof. Corr stated that the 
e 
in New Mexico during 1874 in connection with the Wheeler U. 5. 
topographical and geological survey, embraced the eastern slope 
of the Rocky Mountains from Pueblo to the Sangre de Ch risto 
sete for forty miles to the westward of it, from the latitude of 
Sierr — as far south as the road from Santa Fé to Fort 
‘Aasthier ies mportant di isdovery: is the lacustrine character of the Tri- 
he beds which form a 1 se of the axis of the range ; _ 
f 
