Note Footnote 7: — Front matter

[7] I have given in this chapter an original sketch (Fig. 12), in which I have sought to embody chiefly the one idea of power, energy, force, or vigour; and in order to do this, I have employed such lines as we see in the bursting buds of spring, when the energy of growth is at its maximum, and especially such as are to be seen in the spring growth of a luxuriant tropical vegetation; I have also availed myself of those forms to be seen in certain bones of birds which are associated with the organs of flight, and which give us an impression of great strength, as well as those observable in the powerful propelling fins of certain species of fish.