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 w. 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. 
Zo = 6.8 14 = 47.6 26° = 88.4 
3 = 10.2 t Bo) ae Ie 27 = 91.8 
4 = 13.6 16 = 54.4 28) = 19522 
Soe ae foe ae sy aes) 29 = 98.6 
6 = 20.4 LSS 2 2615.2 30 = 102. 
a2 2558 19 = 64.6 oie LOS 
Sie 21.2 20 = 68. 32, = 10878 
9 = 30.6 PA fet Sys} AAG, 
10 = 34. 22 ia AS, 34 = 115.6 
igen 5 ih: Di SS SEY 
i= 4058 24 = 81.6 
The customary symbols are used in presenting the data of the graphs, 
f, designating frequency; M, mean; oc, standard deviation; and CV, co- 
efficient of variability. 
