Prepare students for lab activity. Have microscopes and beakers with samples set up, and make sure each student has his or her interactive notebook ready.
Start with samples 1-4, have them smell each sample and record in their notebooks their own description of what samples 1-4 each smelled like. Repeat with samples 5-8.
Next, have them match 1-4 with 5-8 and when their final choices are made, remove the filters or cloth from the top and some of the paper if necessary, so that they can see what they were smelling (keep number labels affixed so that they can refer to their notes to compare their descriptions with what they see). Have them draw and name what they see after the samples have been revealed.