"I've found it!  I've found it!  I have found a re-agent
which is precipitated by hemoglobin, and nothing else!"
--The first words of Sherlock Holmes,  A Study in Scarlet
 
The Analysis of Human Blood
"You have come up from the south-west I see...
That clay and chalk mixture which I see upon your toe caps is quite distinctive."
--Sherlock Holmes,  The Five Orange Pips
The Analysis of Soil
"I found on one of the window-sills a number of absurd little
dancing figures like these upon the paper..."
--Mr. Hilton Cubitt,  The Adventure of the Dancing Men
 
Decipher the "Dancing Men"
"Which is it to-day, morphine or cocaine?"
--Dr. John Watson, The Sign of Four
Preparation of a "Seven Percent Solution" 
"Put it down!  Down, this instant, Watson - this instant I say!"
--Sherlock Holmes,  The Adventure of the Dying Detective
The Analysis of Poison  
"Pipes are occasionally of extraordinary interest....
This is Grosvenor mixture at eightpence an ounce"
--Sherlock Holmes,  The Yellow Face
The Analysis of Pipe Tobacco
"Oh, this is a Havana, and these others are cigars of the peculiar sort
which are imported by the Dutch from the East Indian colonies."
--Sherlock Holmes, The Resident Patient
Analysis of Cigars
"I saw that it was more than a stain.  It was the well-marked print of a thumb."
--Dr. John Watson,  The Adventure of the Norwood Builder

Identification of Finger Prints

"I lay upon the sofa and tried to interest myself in a
yellow-backed novel."

--Dr. John Watson, The Boscombe Valley Mystery

 Solve a Holmseian Mystery