_General Conclusions_, p. 100.
Species produced by direct action of environment, 100. The transforming
influences of climate, 103. The origin of variability, 107. The
influence of isolation, 109. Cyclically acting causes of change produce
cyclically recurring changes, 111. Specific constitution an important
factor, 112. A “fixed direction of variation,” 114.
_Appendix I._, p. 117.
Experiments with _Araschnia Levana_, 117. Experiments with _Pierinæ_,
122.
_Appendix II._, p. 126.
Experiments with _Papilio Ajax_, 126. Additional experiments with _Pap.
Ajax_, 131. Experiments with _Phyciodes Tharos_, 140: with _Grapta
Interrogationis_, 149. Remarks on the latter, 152.
_Explanation of the Plates_, p. 159.
=Part II.=