VIII. Origin of species (I'hylogenesis). 



1. Special creation 7's. organic evolution. 



i. Special creation. 



ii. Unity of Nature as shown by geology. 



iii. Organic evolution. 



a. Meanings of the word " Evolution.'' 

 d. Evidences of organic evolution. 



2. Theories of organic evolution. 



i. The rise of the theory of descent, 

 ii. The theory of direct modification, 

 iii. The theory of selection, 

 iv. Neo-Lamarckians ts. Neo-Darwinians. 



3. Examination of supposed factors in organic evolution. 



i. \'ariation and heredity, 

 ii. Struggle for existence, 

 iii. Natural selection. 



iv. Panmixia and the reversal of selection. 

 V. Sexual selection. 

 vi. Isolation, or segregation, 

 vii. Inheritance of acquired characters, 

 viii. Constitutional tendency. 



4. General conclusions. 



IX. Deductions from the theory of evolution. 



