lO PROCEEDINGS OF THE CANADIAN INSTITUTE. 



based Upon a species of ammonite; and by the use of these zones in determining 

 the precise age of one species relatively to another, he has been able to produce 

 the genealogical tree of the Jurassic ammonites in a manner which should be 

 satisfactory to the evolutionist. Doubtless this attempt, to divide up the geological 

 formations into zones named from apparently dominant species and to work out 

 with this aid the phylogeny of families or orders may be carried too far. Clearly, 

 however, by being able to divide the formations on biological grounds, so as to 

 establish with reasonable precision the relative moment when a particular species 

 arrived and flourished,- and by being able to study young and mature individuals 

 of the species- so as to work out its embryology, great pr.ogress is being made in 

 the history of the development of species through the medium of fossils. 



I feel that 1 .owe the members of the Institute an apology for the character of 

 my address. My business duties preclude the possibility of engaging in original 

 ihvestigation even if I possessed ability of that kind. I have, therefore, merely 

 sought by an address of a popular character to engage your attention regarding 

 a branch of study which has been a s.ource of deep interest to myself for many 

 years. 



