CONTENTS. 



I. — Derivation of Organic Beings. 



1. — Parental Derivation a distinctive character of Or- 

 ganic Bodies, ..... 



2. — Grounds for disallowing the theory of a Physical 

 Derivation or Spontaneous Generation of Living 

 Beings, ...... 



3. — Derivation from one, or from two Parents, 



4. — Tendency of these modes of i)i"opagation to Alter- 

 nate, or recur periodically, when they co-exist in 

 the same species, ..... 



5. — Distinction of Cases of Alternation into livotortwr- 

 phic, orthomorphic, and gamomorphic, according 

 to their relations in the Genetic Cycle, 



6. — Indications of Representative Phenomena in the 

 Higher Species, ..... 



II. — Survey of the Reproductive Process in the 

 Vegetable Kingdom. 



Page. 

 1 



2 

 9 



10 



12 

 15 



1. — Introductory Remarks, 



2. — General character of the process in the Vegetable 

 Kingdom, 



3. — Reproduction in the Protophyta, 



4. — In Alg?e generally, and Characese, 



5. — In Fungi and Lichens, 



6. — In Hepaticae and Mosses, 



7. — In Ferns and Equisetacese, 



8. — In Lycopodiacese and Rhizocarpess, 



9. — In Gymnospermous Phanerogamia, 

 10. — In Angiospermous Phanerogamia, 

 11. — Concluding Remarks, 



17 



20 

 22 

 32 

 40 

 49 

 52 

 55 

 57 

 61 

 66 



