A PRELIMINARY REPORT ON CLAYS OF FLORIDA 155

 Physical Properties of Barrineau Bros. Clay, Quintette (Lab. No. o-68).
 Plasticity, judged by feel ............ Excellent.
 W ater of plasticity................. 25.00%
 Pore water ........................ 0.38%
 Shrinkage water ................... 24.62%
 Linear air shrinkage................ 11.4 %
 Volume air shrinkage............... 37.2 %
 Modulus of rupture, average........ 421.0 pounds per square inch.
 Slaking test ....................... 10 minutes.
 Steel hard at cone 010.
 Fire tests:
Temperature. Linear Shr. Absorption. Porosity. Color.
 Per Cent. Per Cent. Per Cent.
 950*C. 0.4 12.68 26.45 Cream.
 1050 0.6 12.14 25.40 Cream.
 1150 1.1 8.88 22.70 Buff.
 1190 1.6 8.31 20.00 Buff.
 1230 1.8 8.22 19.40 Buff.
 1310 2.6 5.03 17.00 Gray.
 1370 2.6 4.62 16.80 Gray.
 1430 3.1 2.54 10.25 Gray.

 Only about ten feet of this clay are exposed above the river at Dexland Bluff, six or seven miles south of Quintette. The deposit, however, probably has a much greater thickness. Its physical properties are:

 Physical Properties of Dexland No. i (Lab. No. o-82).
 Plasticity, judged by feel............ Excellent.
 W ater of plasticity................. 27.95%
 Pore water ........................ 1.30%
 Shrinkage water ................... 26.65%
 Linear air shrinkage................ 10.0 %
 Volume air shrinkage............... 30.3 %
 Modulus of rupture, average........ 547.4 pounds per square inch.
 Slaking test ....................... 24 hours.
 Steel hard at cone 010.
 Overfires at cone 18.
 Fire tests:
Temperature. Linear Shr. Absorption. Porosity. Color.
 Per Cent. Per Cent. Per Cent.
 9500C. 0.2 18.43 29.20 Pink.
 1050 1.5 18.75 32.20 Gray.
 1150 2.5 13.80 27.80 Brown.
 1190 5.0 10.45 22.20 Brown.
 1230 5.0 11.07 25.10 Buff.
 1310 5.0 7.66 18.70 Buff.
 1370 5.0 5.74 16.55 Buff.
 1430 7.5 3.88 12.30 Buff.

 At Molino two brick plants are now in operation. Both of these are located on the Louisville and Nashville Railroad. The Dolores Brick Company is located about one-half mile and the Pensacola Brick Com-