The Chief Constable treated this as beneath contempt.
“I'll explain the point,” he pursued, “and then you'll know as much as I do. A pure substance melts at a higher temperature than it does when it's contaminated by even a trace of some foreign material. Suppose that you had been given a stuff which you thought was pure quinine and you had no chemicals handy to do the ordinary tests for quinine. What you'd do would be this. You'd take the melting-point of your sample first of all. Then to the sample you'd add a trace of something which you knew definitely was quinine—a specimen from your laboratory stock, say. Then you'd take the melting-point of this mixture. Suppose the second melting-point is lower than the first, then obviously you've been adding an impurity to your original sample. And since something, that you know definitely to be quinine, has acted as an impurity, then clearly the original stuff isn't quinine. On the other hand, if the addition of your trace of quinine to the sample doesn't lower the melting-point, then your original sample is proved to be quinine also. That mixing of the two stuffs and taking the melting-point is what they call ‘taking a mixed melting-point.’ Does that convey anything to you?”
“Not a damn, sir,” Flamborough admitted crudely, in a tone of despair. “Could you say it all over again slowly?”
“It's hardly worth while at this stage,” Sir Clinton answered, dismissing the subject. “I'll take it up again with you later on, perhaps, after we get the P.M. results. It was an illuminating conversation, though, Inspector, if my guess turns out to be right. Now there's another matter. Have you any idea when the morning papers get into the hands of the public—I mean the earliest hour that's likely in the normal course?”
“It happens that I do know that, sir. The local delivery starts at 7 a.m. In the suburbs, it's a bit later, naturally.”
“Just make sure about it, please. Ring up the publishing departments of the Courier and the Gazette. You needn't worry about the imported London papers.”
“Very good, sir. And now about this journal, sir?” the Inspector added with a touch of genial impishness in his voice.
“Evidently you won't be happy till I look at it,” Sir Clinton grumbled with obvious distaste for the task. “Let's get it over, then, since you're set on the matter.”
“So far as I can see, sir,” Flamborough explained, “there are only three threads in it that concern us: the affair he had with that girl Hailsham; his association with Mrs. Silverdale; and his financial affairs—which came as a surprise to me, I must admit.”
Sir Clinton glanced up at the Inspector's words; but without replying, he drew the fat volumes of the journal towards him and began his examination of the passages to which Flamborough's red markers drew attention.