CLAT 2008 Question Paper with answer key for online practice

"While investigating the murders of Stangerson and Enoch Drebber he got into conversation with fellow detectives which runs as follows: "The last link My case is complete.... Could you lay your hands upon those ills". After he got those pills, Holmes cut one of them, dissolved it in water and placed it in front of the terrier. Contrary to his expectations, the animal survived. Though disappointed a bit, he thought for a while and then cut the other pill, dissolved it, added milk and placed before the anima. The moment it licked, the animal died. Those were the pills present at the scenes of crime. Which one of the following aptly describes the method which this passage indicates?