266 ‘ 
Hyatt, Alpheus, 192. 
Methods of Studying Segregation, 154. 
Earlier and Earlier Inheritance, 189. 
Decline in Individual and in Type, 190. 
Impregnational Isolation: 
And Selection, 82, 87-111. 
Importance of, 95-101. 
Indiscriminate— 
Mode of the Four Principles, 132-136. 
Survival, 133. 
Equals Indiscriminate Elimination, 136, 152, 
209. 
Isolation, 133, 150, 152, 186, 252-255. 
Success, 134, equals Indiscriminate Failure, 
136. 
Partition, 134. 
Contrast in Discriminate and Indiscrimi- 
nate Action, 134-136, 150. 
Table of Discriminate and Indiscriminate 
Forms, 136. 
Elimination, Computation Showing Effect of, 
210. 
Individual Variations: 
Considered of no Effect by Mutationists, 
71-77. 
Importance of, Shown, 73-77. 
And Degeneracy of Eyesight, 74-75. 
And Degeneracy in Cuckoo, 75-76. 
And Degeneracy in Milk Giving, 74. 
Selection of, Leads to Mutation, 77. 
Innovation: 
And Variation, 46, 51, 59. 
Molding of Innovation and Tradition, 60. 
Intension: 
The Law of, 192-194. 
Selectional, 195-209. 
Indiscriminate Eliminational, 209-211. 
Computation of Indiseriminate Elimination, 
ZVOF 
Amalgamational, 211. 
Equals Intensive Segregation, 185-243, 262. 
Isolation: 
In Its Broader Meaning, 6. 
And Divergent Evolution, 7. 
Considered by Lamarck and Packard, 7. 
With Variation Causes Divergence, 29. 
Importance of, 51. 
Defined, 53. 
Coincident, 66-67. 
Caused bv Partition, 67-68. 
Structural, 68-70. 
Reflexive, 81—114. 
Conjunctional, 82-83. 
Impregnational, 82, 87-111. 
Institutional, 82, 114. 
Sexual, 83-84. 
Social, 83-85. 
Family, 86. 
Dimensional, 87—88. 
Structural, 87—89. 
Potential, 87, 89-90, 108-111. 

INDEX. 
Isolation—Continued. 
Environal, 115, 118-128. 
Endonomic, 115, 118-122. 
Industrial, 115, 119-123. 
Chronal, 115, 123-125. 
Seasonal, 115, 124-125. 
Cyclical, 115, 123-124: 
Migrational, 115, 126-127. 
Heteronomic, 115, 118, 126, 128. 
Transportational, 115, 126. 
Geological, 115, 126. 
Fertilizational, 115, 128. 
Artificial, 115, 128. 
Spatial, 125. 
Geographical, 125. 
Localfi25: 
Unbalanced, 149. 
Usually Somewhat Discriminate, 174. 
Principles Intensifying Segregation, 174. 
Use of, and Segregation, 175. 
As Used by Darwin and as Now Used, 185. 
Indiscriminate, of a Few Segregative, 186. 
And Unusual Opportunities for Migra- 
tion, 221. 
And Unstable Adjustments, 249-252. 
Jennings, Herbert S., ‘‘Contributions to the Study 
of the Behavior of Lower Organisms,’’ 189. 
Jevons, W. S., ‘‘ Principles of Science,’’ 210. 
Jones, Rev. J. P., The Formation of New Castes 
in India, 143. 
Jones, Lynds: 
Accommodation in Birds, 64. 
Degeneracy in Nesting Habits, 76. 
Kidd, Benjamin, ‘‘ Principles of Western Civiliza- 
tion,”’ 30. 
Lamarck, 7, 34. 
Lankester, Prof. E. Ray, 9. 
On ‘‘Like to Like’’ as a Principle, 245-248. 
Correlated Variation, 260. 
Le Conte, Joseph, 215. 
Marlatt, C. L., On the Periodical Cicada, 124. 
Mayer, A. G.: 
Dextral and Sinistral Partule, 70. 
“(A Study in Variation of Partula,”’ 155-156. 
Modes: 
Of the Four Principles, 80. 
Environal, of Influence, 80, 115-129. 
Reflexive Mode of Influence, 80-114. 
Regressive Mode of the Principles, 129-131. 
Discriminate and Indiscriminate Modes, 
132-136. 
Morgan, C. Lloyd, 45, 189. 
‘“‘Habit and Instinct,’ 21, 61. 
“Coincident Variation,’’ 61. 
‘*Animal Behavior,” 61. 
Natural Selection of Innate Characters, 256. 
Morgan, T. H.: 
“Evolution and Adaptation,”’ 71, 73. 
On Mutations, 71-73. 
Mutation, 70-77. : 
And Varieties, 71. 
Expounded by T. H. Morgan, 71-73. 
Theory Loses Sight of Certain Facts, 73-77. 
