What are the similarities and the differences between "The Glasgow Mystery" and "The Adventure of the Speckled Band"?
1. Read both stories.
2. Take notes, using either a three-column graphic or a Venn Diagram
http://www.enchantedlearning.com/graphicorganizers/tchart/
Scroll down to see the T-charts, but use three columns instead of two.
OR
http://www.eduplace.com/graphicorganizer/pdf/venn.pdf
3. Make sure you're clear on how to write a comparison/contrast paper, if that's what your assignment is.
http://grammar.ccc.commnet.edu/grammar/composition/comparison.htm
Once you've written up your ideas, be sure to post them, and someone here will be able to give you feedback.