268 
Segregation—Continued. 
Negative and Positive, Coéperating, 101-111, 
182-183. 
Cumulative, Illustrated in Plant Species, 
108-111. 
Intensifying, 151. 
Autonomic, 151. 
Control of, 151, 156. 
Conditions Favoring, 154. 
Favorable Conditions for, in Partula, 155. 
Reflexive, 159-183. 
Conjunctional, 159-163. 
Social, 160. 
Sexual, 160-162. 
Germinal, 162—163. 
Floral, 162-163. 
Impregnational, 163-171. 
Impregnational Alone is Negative, 163. 
Dimensional, 165. 
Structural, 165. 
Potential, 166-170. 
How Accumulated, 168. 
Institutional, 171. 
The Importance of Impregnational, 172— 
174. 
Meaning of Isolation and, 175. 
Forms of, 176. 
Computation of, 177-183. 
Intensive, 175—176, 185-243, 262. 
Forms of Intensive, 185-212. 
Forms of, Codperate, 247—248. 
Divergent Evolution Through Cumulative, 
159-183, 262. 
Selection: 
Not Always the Cause of Divergence, 3-6. 
Divergence that is not Due to Sexual, 3. 
Nor to Natural, 4—5. 
Of a Species Does Not Change the Species, 
14. 
Of Other Than Average Varieties Produces 
Change, 15. 
When Unbalanced Produces Change, 15. 
Conditioned by Fertility, 15. 
Of Average Forms Tends to Stability, 16, 
195-196. 
Fecundal, Due to Superior Fertility, 16. 
May Produce Diversity or Unity, 25, 29. 
Diversity of, with Isolation Causes Diver- 
gence, 8, 22. 
How Far an Explanation of Divergence, 
29-34. 
What it Does Not Explain, 29-31. 
How Far Determined by Environment, 
31-32. 
Endonomic, One Form of Autonomic, 32. 
May be Changed Without Change in Envi- 
ronment, 33. 
Statistical Proof of Natural, 34. 
Reflexive, 36, 45. 
Active and Passive, 45. 
Headley says, May be Controlled by the Or- 
ganism, 46. 
* See under Sexual. 

INDEX. 3 
Selection—Continued. 
Defined, 53, 195. 
Coincident, 61, 63, 64, 65, 68. 152. 
Organic, 61, 62, 152. 
Endonomic, in Cliff Swallows, 63. 
In Chimney Swift, 64. 
In Tree Swallow, 64. 
In House Wren, 64. 
In Infants, 64. 
Defined, 65. 
And Coincident, 65-67. 
Illustrated by Swimminz Cats, 67—68. 
Structural, 68-70. 
Reflexive, 82-114, 151, 197. 
Conjunctional, 82-83, 197. 
Dominational, 82, 86-87, 197, 203. 
Impregnational, 82, 87-111, 197, 206. 
Institutional, 82, 111-112, 153, 197, 207. 
Prudential, 82, 111-114, 153, 197, 207. 
By which Man May Control His Own 
Evolution, 112, 153. 
Sexual,* 83-84, 200-202. 
Social, 83-84, 202-203. 
Filio-parental, 83, 86, 203. 
And Lactation, 204. 
Dimensional, 87-88, 204-205. 
Structural, 87-89. 
Potential, 87, 89. 
Fecundal, 87, 90 —95, 206. 
Environal, 115-118, 196, 200 
Endonomic, 115-117, 152, 156, 197. 
Habitudinal, 115-117. 
Aptitudinal, 115-117. 
Heteronomic, 115, 117-118, 197. 
Natural, 115, 117-118. 
Artificial, 115, 117-118. 
Forms of, Defined, 139. 
Conditions Determining the Forms of, 140. 
Unwarranted Assumption Concerning Nat- 
ural, 144-145. 
Unbalanced, 149. 
Cessation of, 198. 
Rational and Adaptational, 199. 
Forms of, Classified. 199. 
Self-cumulative Endowments, 96-98. 
Sexual— 
Election, 83-84. 
Isolation, 83-84. 
Selection, 83, 200-202. 
Darwin says Caused by Divergent In- 
stincts; what Causes the Latter, 11, 
200. 
Explanation given, 201. 
Il!ustrated by Creeping Cricket, 200. 
Social— 
Election, 83, 85. 
Isolation, 83, 85. 
Partition, 83, 85. 
Selection, 83-84. 
Species: 
Intergrading Between, 40—42. 
Statistical Test of, 40. 
