The gradation of the ledge coral is as follows: Per cent Passing 1" u . * ” " n 9 m u 8 a #10 5 9 7 #40 4 a t #80 2 " #200 1 w . Coral 100 Beach 3/4" 88 1/2" 50 4/gn 9 Sand The coral beach sand is unusually good, being sharp, graded and of high stability. Absorption after being dried to constant weight and submerged for 48 hours is 3.5 per cent. The Modified Florida Bearing Value ~ is unusually high, showing 1,000 pounds per square. inch. The gradation of the coral sand ia as follows: Per Cent Passing 1/2* 100 " * ” 1/4" 99 _ 8 » #10 (98 " " " #10 a7 it a a #80 1 . " » #200 trace Aggregate It ia recommended in order to secure the most favorable gradation of the two aggregates mentioned above that they be blended in equal parts which will produce e combined grading as follows: Per Cent Passing 1* 5-284 100 _ "3/4" 9 a n 75 " 1/2"