Explanation of the tables II — IX. 



The area, bounded by the curve, represents the percentage of 

 the different sizes of grains in the samples; of the two lots wherein 

 each of the figures is devided the upper one, to the left, shows 

 the amount of clay substance, the rest represents the amount of 

 the other mineral ingredients, and herein is also included the very 

 small number of organisms. Further explanation is to be found on 

 pages 34 — 36. 



