"Brandon seems to have taken a good deal of trouble, but this kind of investigation needs the strictest accuracy, and we haven't the best of testing apparatus," Bethune remarked. "I expect he'll allow that the results he has got may be to some extent misleading, and I doubt if it's worth while to go on with the matter. Are you sure you have made no mistakes, Dick?" Dick pondered for a few moments. If he were right, as he thought he was, the statements he had to make would lead to the discharge of the sub-contractor. Remembering his own disgrace, he shrank from condemning another. He knew what he had suffered, and the man might be innocent although his guilt seemed plain. It was a hateful situation, but his duty was to protect his master's interests and he could not see him robbed. "You can check my calculations," he answered quietly. "That's so," agreed Stuyvesant, who added with a dry smile as he noted Bethune's disapproving look: "We can decide about going on with the thing when we have heard Brandon." "Very well," said Dick, giving him some papers, and then indicated two different rows of the small concrete blocks. "These marked A were made from cement in our store; the lot B from some I took from Oliva's stock on the mole. They were subjected to the same compressive, shearing, and absorbent tests, and you'll see that there's very little difference in the results. The quality of standard makes of cement is, no doubt, much alike, but you wouldn't expect to find that of two different brands identical. My contention is that the blocks were made from the same stuff." Stuyvesant crossed the floor and measured the blocks with a micrometer gage, after which he filled two of the graduated glass measures and then weighed the water. "Well?" he said to Bethune, who had picked up Dick's calculations. "The figures are right; he's only out in a small decimal." Stuyvesant took the papers and compared them with a printed form he produced from his pocket. "They correspond with the tests the maker claims his stuff will stand, and we can take it that they're accurate. Still, this doesn't prove that Oliva stole the cement from us. The particular make is popular on this coast, and he may have bought a quantity from somebody else. Did you examine the bags on the mole, Brandon?" "No," said Dick, "I had to get my samples in the dark. If Oliva bought the cement, he must have kept it for some time, because the only man in the town who stocks it sold the last he had three months ago. The next thing is our storekeeper's tally showing the number of bags delivered to him. I sat up half the night trying to balance this against what he handed out and could make nothing of the entries." "Let me see," said Bethune, and lighted a cigarette when Dick handed him a book, and a bundle of small, numbered forms. "You can talk, if you like," he added as he sharpened a pencil.