No. 422.] QUANTITATIVE STUDY OF VARIATION. 143 






































































































































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Fic. 37. — A ster given s Mu face for 117 heads collected on September 27. 

hl. 
subject and | disk florets relative. p= .573693 + .033347- 



























































































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Vic. 38. — Aster prenanthoides s Muhl. Correlation surface for 143 heads collected on September 3° 
Rays subject and disk flore ets relative. p=.358909 + 5. 
