Notes
I. ON THE LAW WHICH HAS REGULATED THE INTRODUCTION OF NEW SPECIES.
1
Professor Ramsay has since shown that a glacial epoch probably occurred at the time of the Permian formation, which will more satisfactorily account for the comparative poverty of species.
2
The theory of Natural Selection has now taught us that these are not the steps by which limbs have been formed; and that most rudimentary organs have been produced by abortion, owing to disuse, as explained by Mr. Darwin.
II. ON THE TENDENCY OF VARIETIES TO DEPART INDEFINITELY FROM THE ORIGINAL TYPE.
1
This is under estimated. The number would really amount to more than two thousand millions!