References
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- 1881 . Remarkable Cases of acquired Resemblance among Butterflies . Kosmos , ‘Nature,’ vol. xxvi. p. 86.
- Weismann's Studies in the Theory of Descent Engl. edit. Appendix 529 529
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- Jen. Zeit. , xi 99 – 99 .
- Origin of Species , 6h ed. 377 – 377 .