} 5 Carboniferous
39 Sauria (lizards, &c.) Sauria / formation
40 Chelonia (tortoises) Chelonia / 3rd month, that of a turtle;
41-46 Birds _Footsteps of Birds_ 6 New Red Sandstone 4th month, that of a bird;
47 Cetacea (dolphins, whales, &c.) _Bones of a \
Cetaceous Animal_ } 7 Oolite
_Bones of a Marsupial_ /
8 Chalk
48 Pachydermata (tapirs, &c.) Pachydermata \
49 Edentata (sloths) Edentata \
50 Rodentia (squirrels, hare, &c.) Rodentia \ 5th month, that of a rodent;
51 Marsupialia (opossums, &c.) Marsupialia \
52 Ruminantia (oxen, stag, &c.) Ruminantia \ 6th month, that of a ruminant;
53 Amphibia (seals) } 9 Tertiary
54 Digitigrada (dog, cat, &c.) Digitigrada / 7th month, that of a digitigrade animal;
55 Plantigrada (bear, &c.) Plantigrada /
56 Insectivora (shrew, &c.) Insectivora /
57 Cheiroptera (bats) Cheiroptera /
58 Quadrumana (apes) Quadrumana / 8th month, that of the quadrumana;
29 Bimana (man) Bimana 10 Superficial deposits 9th month, attains full human character.

TRANSMUTATION OF SPECIES.

In the two last sections we have gone through the earth's geological
history, first of the changes in its physical structure, next of the
mutations in the organic forms that have, in serial order, appeared in
the successive strata of its external envelope, from the period of that
far distant crisis when it was a molten globe on which its primitive
granitic covering was just beginning to concrete, in consequence of
abating heat, until we have arrived at the first prognostic signs of
approaching human existence.

The rock upon rock of vast thickness, by which the earth's crust,
through countless ages, has been formed, unquestionably constitutes a
most