GENERAL EXPLANATION OF GRAPHS 



All graphs on a page are drawn to the same scale. In all graphs of 

 length and breadth the class value is 3.4 /x. All computations are based on 

 class values. These in case of length and breadth can be converted to 

 microns by use of the factor 3.4, or by the following table of equivalents: 



Class Microns Class Microns Class Microns 



1 = 3.4 13 = 44.2 25 = 85. 



2 = 6.8 14 = 47.6 26 = 88.4 



3 = 10.2 15 = 51. 27 = 91.8 



4 = 13.6 16 = 54.4 28 = 95.2 



5 = 17. 17 = 57.8 29 = 98.6 



6 = 20.4 18 = 61.2 30 = 102. 



7 = 23.8 19 = 64.6 31 = 105.4 



8 = 27.2 20 = 68. 32 = 108.8 



9 = 30.6 21 = 71.4 33 = 112.2 



10 = 34. 22 = 74.8 34 = 115.6 



11 = 37.4 23 = 78.2 



12 = 40.8 24 = 81.6 



The customary symbols are used in presenting the data of the graphs, 

 f, designating frequency; M, mean; o-, standard deviation; and CV, co- 

 efficient of variability. 



