No. 422.] QUANTITATIVE STUDY OF VARIATION. 141 













































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Fic. 33. — Aster dio cet Jes Muhl. Correlation surface for 117 heads sings on September #7. 
Rays subject and bracts relative. p= .855944 + -0122 

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Fic. 34. — Aster prenanthoides Muhl. Correlation surface for 143 heads collected on September 30. » 
Rays subject and bracts relative. P= 833702 + .012701. 

