APPENDIX B. 341 



case of the failure of any of them, they may be repeated in his presence. If the con- 

 tractor so desires, the Engineer Officer in charge may, if he deems it to the interest of 

 the United States, have any or all of the tests made or repeated at some recognized 

 testing laboratory in the manner herein specified, all expenses of such tests to be paid 

 by the contractor. All such tests shall be made on samples furnished by the Engineer 

 Officer from cement actually delivered to him. 



