“ In Physiology, what is the meaning of that great law of adherence to ty^)e and pattern, standing behind, 
as it were, and in reserve, of that other law by which organic structures are specially adapted to special modes 
of life ? What is the relation between these two laws ; and can light be cast upon it derived from the history 
of extinct forms, or from the conditions to which we find that existing forms are subject? ” 
Duke, of Argyle's Address as President of the British Association, 1855 - 
“ The combination, in many extinct types, of characters which, in later ages, appear disconnected in 
different types, exhibits thought, prophetic thought, foresight ; combinations of thought preceding their mani- 
festations in living forms.” 
Agassiz' Essay on Classification in Contributions to the Natural History of the United States, Vol. I, p. 13U- 
