Mineralogy and Geology. _- 271 
them from the elevated place where he stood. The day was clear 
and hot, and there were neither clouds nor wind. The particles of 
water in the cones had a spiral motion from east to west with a linear 
progress from south to north.—p. 274, March 17, 1851 
thynia, Galatia and Paphlagonia; by M. P. pe Tontmatcuerr.—pp. 
280-312, with a map, March 17,1851. Silurian fossils of the vicinity 
of Rennes ; by M. Martz Ronait.—pp. 358-389, April 21, 1851. 
5. Memoires de la Société Géologique de France, 2nd ser. vol., iv. Part 
1, pp. 4to, with 11 plates. The first memoir is on the fossils of 
the secondary period collected in Chili, by J. Domeyxo, Prof, Chem. de 
Geol. et de Min. 4 ’'Univ. de Coquimbo, and on the strata to which 
Were considered Cretaceous by D’Orbigny in his work on South Amer- 
lea; this formation appears to be of great extent in Chili and is found 
eru. 
also in P 
With the true chalk, by A. LeyMERIE. 
6. Researches in Terrestrial Physics ; by Henry Henessy, M.R.I.A., 
f. 
h’s 
The value of the earth’s ellipticity when entirely fluid, as obtained 
by Prof. Henessy, was s52.55 — z4s3 its primitive ellipticity was there- 
fore a little less than its present ellipticity. 
: d with the viscidity of the strata of the nucleus in lm. 
iate contact with it, would tend to equalize the motions of both 
shell and nucleus, and to cause the whole to rotate as one mass. 
