a measure of relatedness between two antigenic substances
Another great adventure - murder by poison dart, a hidden treasure, and one of the criminals actually has a wooden leg! A triumph for Holmes and a romance for Dr. Watson. This book was better constructed than A Study in Scarlet, with the "explanation" limited to a chapter near the end which was better integrated into the main story.
David Timson's expert reading brings it all to life, making this a truly 4-star experience.