calcareous tuff is immediately covered by the lavas and pene 
roducts which extend from the volcanic uplands to the plain 
are now ni arte at the heights of 2400 and 4500 French feet and 
the level of the ocean. 
' ost desi stabhde’ is the difference of the results which elevating vol- 
eanic forces, and particularly eruptive volcanic action, which Is still 
continuing, although with diminished ae on our are have pro- 
duced in the development of the forms of 1 pper and Lower Cau- 
and only onnaa! in a few places; in the latter, heaving and eruptive 
forces were most effective, and a masses driven directly from the vol- 
horizontal extent. From this difference is derived the greater variety 
and more favorable development of the natural features of the 
Caucasus, and with this its ethnographical importance is most 
nnected. 
epregec, by ILNE Epwarps, rine es Set 
5.)—Milne gingers in this learned memoir, in 
in a connected form, the views elsewhere presented by him in de 
of animals are best exhibited in the metamorphoses of species,— 
standing by the term metamorphosis, the series of changes und 
y all animals in the progress of their development from the 
ifferent animals within the egg state, and the rest 
leaving it. In 1829, Milne Edwards brought out these views, with spe- 
cial reference . the metamorphoses of crustacea ; and farther shied 
crustacea have their — Bepryeererar ole to one another in their 
yore and more phot part of the series of genetic 
er : is easy to show that it is the general foudeway: in nature to pre 
-exhibi bited when the species have completed their development. 
ifications which are manifested successively in the constit! 
as it enlarges, determine successively 1 
