aand y 
thes ame organic remains, and posse Dsi- 
tion; it is not on that pan seniall vrobabie aa 
epochs of their formation are very distant from each other, 
when the fossils = dissimilar. "We conceive that in the 
same zone, in a country of small extent that the generations 
of animals have fecicidal each other, and characterized 
as it were, by peculiar types the epochs of — mes ; 
ut beings of various forms at great horizontal di 
may have occupied at the same time, in different climates, 
the itive of the globe, or the basin of the sea. We may 
observe farther, that the position of 3 between a and ves 
that it is anterior to the formation y and rpg = heag of 
a; but there is nothing which, enables to measure the 
interval of time which ela aps sed batlesdie a diiponitiod of 
the strata; one. the different isolated deposits of 8 may not 
be simultan 
I have pile my last remarks from the essay of the cele- 
brated M. de Humboldt a the oe of rocks, be- 
—_ they a peared to me to be connected with those ob- 
ich I have partes the liberty to offer M. sti 
art. eae that respectful consideration, which I entertain for 
the merits of so distinguished a philoso her. 
Observations upon the situation in which Orsaise. Remains 
e fo 
Among the observations which have been made upon the 
position of organic remains, this certainly is a highly im- 
portant one ; that different strata belonging to distinct rock 
formations, or to the same formation, as is sometimes the 
case, are distinguishable by means of "vegetable and animal 
remains, which appear to be peculiar to these strata, or at 
least, are but rarely noticed in others. Thus we find in the 
reat coal formation, a large number of vegetable fossils pe- 
culiar to this formation, and very unlike existing p. 
y are referable to the arundinacexe, of which, some ap- 
the cortical _part, w which is covered entirely with ‘regular i im- 
pressions arising from the petioles of the leaves. This dis- 
eription of plants is supposed to have an affinity to the or- 
