IOWA ACADEMY OF SCIENCE 51 



For the curve the magnitudes were grouped eighteen classes, each 

 class being a group of 5 of the magnitudes. The mode is found to lie 

 at class 9 (the magnitude group 39-97 flowers). 



CONSTANTS. 



Class 9= 93— 97 flowers. 



Class 10= 98—102 flowers. 



Class 11=103—107 flowers. 



Class 12=108—112 flowers. 



Class 13=113—117 flowers. 



Class 14=118—122 flowers. 



Class 15=123—127 flowers. 



Class 16=128 — 132 flowers. 



Class 17=133—137 flowers. 



Class 18=138—142 flowers. 



A Study of the Vari.vtion in Length of Flowers (Stamen Tubes) 

 OP the Red Clo\t:r.* 



A large collection of clover heads was gathered from the college 

 campus; and from these 493 flowers were selected for measurement. 



The magnitudes and frequencies observed were as follows: 



Magnitudes 6 cm., .68 cm., .7 cm., .72 cm., .75 cm., .76 cm. 



Frequencies 1, 1, 6, 1, 3, 5, 



Magnitudes 77 cm., .78 cm., .79 cm., .8 cm., .81 cm., .83 cm. 



Frequencies 1, 3, 5, 9, 1, 1, 



Magnitudes 84 cm., .85 cm., .86 cm., .87 cm., .88 cm., .89 cm. 



Frequencies 16, 18, 25, 21, 43, 60, 



*From a study by Miss Mildred Walla. 



