CONTENTS. xi 
Concluding Remarks—Continued. 
Isolation Usually Discriminate and therefore Segregative from the 
Piste ee Ocha. TN ta cotes eh eee em eee ee. oeu htt 174 
Intensive Segregation put in the Next Paper..................... 174 
anieiol forms of Segregation: ; STi e re ea th eee ire 176 
Computation of Effects of Positive and Negative Segregation... ... 177-183 
IUD G15) U1 MAAR a ds Phra Meaba bir, Il Ak ert ooo A. Ue ini 179 
RADE RVGR CN nets os SL: Lene Sire NE eR ee ee 182 
APPENDIX II.—INTENSIVE SEGREGATION. 
{From the Linnean Society’s Journal, Zoology, vol. Xx1it.] 
Classification of the Forms of Intensive Segregation.................. 185-212 
Separation Always Involves More or Less Segregation............ 186 
Hight Principles of Monotypic Evolution....................... 187 
Certain Laws of Growth not here Discussed..................... 189 
The Transformation of Freely Intergenerating Organisms never 
Bemucmentiy wD iKeneetibe Verws Mubh,) she). cua obey gach eae de we missin Ig! 
Independent Transformation Always Divergent................. 19I 
Pervasive Influence of Causes of Transformation.................. 192 
Utilitarian and Non-Utilitarian Divergence..................... 194 
peleciional Intension/and Its Forms, ..0.. 00.50... . se lb beccels 195-207 
Inidiscriminate Eliminational Intension.........:..-:....0.+..... 209 
Pumaleamanonal IMtenStonl so. ok. ea sal rladd oes eet see ren, 211 
Combined Influence of These Principles...............00..4 0500 212 
DE ESEN SS TV OULU oie NA he rae Cn 212-224 
Divergent Evolution in the Snails of Oahws.................+..% 2-220 
Similar Facts Concerning Land-mollusks of Other Regions......... 224 
MODs eae MAO TAD 1 oe OU I sacle Ys fobs 0.2} Sagas d 024i Rind alec oe dion 225-234 
Divergened im Mrynmis and Thanaos).. oc... 556. got ae anes s 225 
DHiviermemispectesio@l, BaSilatGhia. 2p... 6s vn drtnlae vim ode deletes 225 
Diversence im the:Periodical Cicada... cide. save boca cc eee 229 
SOUT GUE IRrre aie ON ae ee 234-243 
Outline of the Argument in Support of Divergence through Cumu- 
JENESTE |S SURE EE LO) a eed eo el ea ee Pea re 234 
Reece AGL SEENON “ors dp. sini2'd!s gant s dom sie Gee Modle  OAR ie Oe 236 
Coustmetion of Permutational ‘Triangle. .... 0.50.2. bya es bs os 241 
APPENDIX III.—LETTERS. 
[Published in “‘ Nature,”’ April 10, May 8, and August 14, 1890, and April 1, 1897.] 
“Like to Like”’ a Fundamental Principle in Bionomics ................ 245-249 
Wiis ERED EME e816 Mo a's, aise: +, ace spa oa Seen RAE FEM tees bo 249 
Local Segregation Often Initiates Divergence.................... 247 
Permanent Difference in Innate Adaptations not Necessarily Ad- 
WmmeomivMNfetenee 5.5... osc 5.510 Lee eee 248 
Unstable Adjustments as Affected by Isolation........ RSC iin eye 249-252 
Indiscriminate Separation, Under the Same Environment, a Cause of 
PER eUnE remem mete SP. eres Ruth RUA g MEE CI ae otra. 252-255 
