CONTENTS. IX 



CHAPTER XXV. 



LAWS OF VARIATION, continued — COEEELATED VAEIA- 

 BILITY. 



EXPLANATION OF TEEM CORRELATION — CONNECTED WITH DEVELOP- 

 MENT MODIFICATIONS CORRELATED WITH THE INCREASED OR 



DECREASED SIZE OF PARTS — CORRELATED VARIATION OF HOMO- 

 LOGOUS PARTS — FEATHERED FEET IN BIRDS ASSUMING THE STRUC- 

 TURE OF THE WINGS CORRELATION BETWEEN THE HEAD AND 



THE EXTREMITIES — BETWEEN THE SKIN AND DERMAL APPENDAGES 



BETWEEN THE ORGANS OF SIGHT AND HEARING — CORRELATED 



MODIFICATIONS IN THE ORGANS OF PLANTS — CORRELATED MON- 

 STROSITIES — CORRELATION BETWEEN THE SKULL AND EARS — SKULL 

 AND CREST OF FEATHERS — SKULL AND HORNS — CORRELATION OF 

 GROWTH COMPLICATED BY THE ACCUMULATED EFFECTS OF NATURAL 

 SELECTION — COLOUR AS CORRELATED WITH CONSTITUTIONAL PECU- 

 LIARITIES Pao;es 31 1-332 



CHAPTER XXVI. 



LAWS OF VAEIATION, Continued — SUMMARY. 



THE FUSION OF HOMOLOGOUS PARTS — THE VARIABILITY OF MULTIPLE 

 AND HOMOLOGOUS PARTS — COMPENSATION OF GROWTH — MECHANICAL 

 PRESSURE — RELATIVE POSITION OF FLOWERS WITH RESPECT TO 

 THE AXIS, AND OF SEEDS IN THE OVARY, AS INDUCING VARIA- 

 TION ANALOGOUS OR PARALLEL VARIETIES — SUMMARY OF THE 



THREE LAST CHAPTERS 333-348 



' CHAPTER XXVII. 



PROVISIONAL HYPOTHESIS OF PANGENESIS. 



PRELIMINARY REMARKS — FIRST PART : — THE FACTS TO BE CONNECTED 

 UNDER A SINGLE POINT OF VIEW, NAMELY, THE VARIOUS KINDS 

 OF REPRODUCTION — RE-GROWTH OF AMPUTATED PARTS — GRAFT- 

 HYBRIDS — THE DIRECT ACTION OF THE MALE ELEMENT ON THE 



