52 BULLETIN 555, U. S. DEPARTMENT OF AGRICULTURE. 



Sampling at point of delivery. — A representative sample should be taken from 

 each carload received. Considerations covered under " Sampling from piles at 

 the plant " apply equally to sampling from cars. 



Shipping. — Samples shipped by freight or express to the laboratory shall be 

 put up in packages containing twelve bricks each, packed in two rows sepa- 

 rated by a partition for protection. 



Condition of bricks before testing. — If bricks are damp, they shall be dried 

 at a temperature of 100° F. before testing. No bricks shall be included in the 

 test lot which would be rejected on the basis of cracks, chips, or other defects 

 covered by the specification clauses for visual inspection. 



