Thomas G. Waddell, Thomas R. Rybolt
The following story is a chemical mystery with emphasis on a blood test, qualitative analysis, and the properties of biological substances. This is the twelfth article in a series presenting a scientific problem in mystery format in the context of the popular and beloved characters Sherlock Holmes and Dr. Watson. There is a break in the story where readers (students and teachers) can ponder and solve the mystery. Sherlock Holmes provides his solution in the paragraphs following this break.
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