%&k Hints for the Formation of 
13. To examine whether there he found on the primi- 
tive mountains, at great heights, the scattered wrecks of 
Secondary mountains. For my part, I never found any. 
14. Whether primitive calcareous stone be found al- 
ways with a granulated fracture, or the form of a saline 
marble, and never under a compact form. 
15. Ought the porphyric schist of Werner, or th epor-- 
phyre schisteux a pate of primitive petro-silex, to be con- 
sidered as primitive or secondary ? The same question in 
regard to the mandelstein or amygdaloid. 
16. Is it fully ascertained, as I thought I observed in 
the Alps, and M. de Fichte! in the Carpathian mountains, 
that there exists pudding-stone or free- stone, if not pri- 
mitive, at least of a formation anterior to that of all the 
other secondary stones ? 
17. Were the granites in a mass first deposited, be- 
cause they were less soluble ? and did they crystallise 
after the quantity or dissolving force of the waters began 
to diminish? and was it for* a contrary reason that the 
gneiss, mica and magnesian stones crystallised later ? 
chap. xvi. 
■# 
Observations to he made on Transitions. 
1 . To observe the intermediary genera and species of 
fossils, between one genus or »ne species of fossil, and 
the genera and species which have the greatest resem- 
blance to them. 
2 . To observe, above all, the transitions through which 
nature has passed, when, having produced one genus or 
one order of mountains, she began to produce a different 
genus or order ; for there is no change of order which has 
not been the effect of a revolution ; * and it is in the transi- 
tions that traces of these revolutions are to be found. 
