CONTENTS. IX 



CHAPTER XXV. 



LAWS OF VARIATION, continued— COnUELATEl> VARIA- 

 BILITY. 



EXPLANATION OF TERM 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 

 (iROWTH COMPLICATED BY THE ACCUMULATED EFFECTS OF NATURAL 

 SELECTION — COLOUR AS CORRELATED WITH CONSTITUTIO^TAL PECU- 

 LIARITIES Pa^es 31 1-3S2 



CHAPTER XXVI. 



LAWS OF VARIATION, 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 



