a 
Geology and Mineralogy. 481 
fissures w races on the er surfaces of the plate were 
approximately parallel; there were often two conjugate series of 
hese fissures, crossing one ano at an angle varying from 90° 
to 70°, or less, 
the fissure-surfaces, there were also a small number of other planes 
represents a pla 
te which has been subje 
cted to the torsion. 
= > 
i = an, Ss 
= = = 
—Se ~N . ‘~ J 
The above results obtained by the torsion or twisting of a plate 
of ice are shown by M. Daubrée to be closely analogous to the 
phenomena of faults and joints observed in rock-masses. There is 
the same approximate parallelism among them; and this is true 
been submitted, torsion is one wh a 
part in connection with the production of faults gg ee 
P te ! 
i which has played a prominent 
3. Notice of a fourth new Phosphate from 
onnecti y Gro 
e 
mineral is salmon-colored and proved on examination to be a 
phosphate analogous to triphylite in composition. It occurs 
