__ Set, Scientific Apparatus Used by Sherlock
Puzzle 18 of Sherlock Holmes Hard Pack
Question is: __ Set, Scientific Apparatus Used by Sherlock
and the answer is: CHEMISTRY
Word Meaning:
CHEMISTRY — (uncountable) The branch of natural science that deals with the composition and constitution of substances and the changes that they undergo as a consequence of alterations in the constitution of their molecules.
Definitions from Wiktionary.