178 Scientific Intelligence. — Mineralogy. 
6. M. Brongniart junior'' s Fossil Botany. — This active and 
intelligent young naturalist has collected a vast store of mate- 
rials for a work on fossil plants. It will appear during the 
course of next year, and will contain descriptions of about 1000 
species, 
7. Cordier'‘s Geology. — Cordier has just finished the compo- 
sition of an extensive work on geology, with a mineralogical 
classification of rocks. 
8. Arrangement of Rocks at Predazzo. — The following, ac- 
cording to Dr Boue, is the arrangement of rocks at Predazzo, 
The upper rock is trap-amygdaloid ; below it fine granular do- 
lerite ; next dolerite with mica ; to this succeeds felspathose do- 
lerite, granitic dolerite, that is with felspar and mica ; and, last- 
ly, at the foot of the hill, granite with quartz, and a dike of 
trap, with coccolite, and large crystals of felspar. On the op- 
posite side of the river is true coarse granular granite, with 
schorl. We have here an instance of tertiary dolerite passing 
into granitose rock, and perhaps even into granite. The whole 
series rests upon chalk. 
9. Supposed cause of the Heat of Hot Springs and Volca-^ 
noes. — It is known that the density, and consequently the heat 
of the atmosphere, increases as we descend into the interior of 
the earth. This being the case, it is probable that the heat of 
springs and volcanoes may be derived from currents of hot and 
dense air, in the deeper regions of the solid mass of the globe. 
MINERALOGY. 
10. Strantites in Yorkshire. — Most of the native combina- 
tions of strontites have of late been found by Dr Peter Murray 
in the West Riding of the county of York, in the vicinity of 
Knaresborough and Pately Bridge. — The carbonate has, for the 
first time in England, been observed at the lead-mine of Merry- 
field, near Pately, in veins and nests, associated with galena and 
sulphate of barytes in calcareous grit. Two varieties have been 
met with : one compact, semitransparent, and of the most splen- 
dent white colour, resembling some kinds of arragonite, and con- 
tains in the 100 parts, 55 of Strontian, 4 Carbonate of Lime, 
of Alumina, Sulphate of Barytes 1, Water and Carbonic 
