CONTENTS. 



the Rattlesnake and Cobra ; as to the Procesa of Formation of the Eye and Ear , as 

 to the Fully-dovelopcd Condition of the Eye and Ear; aa to the Voice; as to Shell- 

 fish; as to Orchids; aa to Ants. — the Necessity for the Slmuitiuieous Modification 

 of Many Individuals. — Sumumry and Conclusion . . . . p. 85 



CHAPTER III. 



THE 0OKXI8TENOK 0? 0L08ELY-BIMILAR 8TRUCTUBE8 OF DIVERSE ORIGIN". 



Chances against Concordant Variations.— Examples of Discordant Ones. — Concordant 

 Variations not uuillieiy on a non-Darwinian Evolutionury lIyix)thosi8. — Placental 

 and Implacentai Mammals.— Birds and Keptllus.— Independent Origins of Similar 

 Sense Organs. — The Ear. — The Eye. — Other Coincidences. — Causes besides Natural 

 Selection produce Concordant Variations In Certain Geographical Kegions. — Causes 

 besides Natural Selection produce Concordant Variations in Certain Zoological and 

 Botanical Groups. — There are Homologous Parts not genetically reLited. — Harmony 

 In respect of the Organic and Inorganic Worlds. — Smnmary and Conclusion . p. 76 



CHAPTER IV. 



MINUTE AND GRADUAL MODIFICATIONS. 



There are Dlfflcultios as to Minute Modifications, even If not fortuitous. — Examples of 

 Sudden and Considerable Modifications of Diflferent Kinds.— Prof Owen's View. — 

 Mr. Wallace. — Prof. Huxley. — Objections to Sudden Changes. — Labyrinthodont. — 

 Potto.— Cetacea.— As to Origin of Buxl's Wing.— Tendrils of Cllmbhig Plants.— 

 Animals once supposed to be Connecting Links. — Early Specialization of Structure. 

 — Macrauchenla. — Glyptodon. — Sabre-toothed Tiger. — Conclusion . . p. Ill 



CHAPTER V. 



AS TO BPEOIFIO BTABILITT. 



What Is meant by the Phrase "Specific Stability;" such Stability to be expected a 

 priorly or else Considerable Changes at once. — Rapidly -increasing DllBculty of in- 

 tensifying Race Characters ; Alleged Causes of this Phenomenon ; probably an In- 



