24 LIFE ON THE EARTH. 



parts of the world, but the Rhea is found in South 

 America, the Ostrich in Africa and Arabia, the 

 Cassowary in the Indian Islands, and the Emeu in 

 Australia. 



The Condor clings to the summits of the Cor- 

 dillera, the Lammergeyer haunts the Alps the Stork 

 knoweth her abiding place. In a word, every living 

 race of plants and animals exists in a province of 

 space ; over which by natural conditions it has been 

 diffused, within which by natural conditions it has 

 been restrained, and beyond which it only passes 

 by a change of these conditions. Thus one place of 

 origin is indicated for each species of plant and 

 animal one locality where it first appeared, whether 

 it still remain there confined to a limited region, or 

 have wandered far away, without losing its prominent 

 characters, through length of time, change of con- 

 ditions, mixture with other races, or any of the 

 innumerable incidents of the ' struggle for existence.' 



I have thus, Mr Vice-Chancellor, recapitulated 

 some of the laws regarding the Conditions and 

 Limitations of Life, which are commonly accepted 

 among naturalists, and must be observed by geolo- 

 gists who desire to work out the problem of the 

 succession of ancient created being. I propose them 

 as the very reverse of novelties, and regard them 



