Go up to the ledge (O).
Take the Chemistâ€™s KIT which will be added to your toolbar (P).
Turn the pages; take the EMPTY DARTS 1/2 (Q).
Take the KEY (R).
Take the JAR SHARDS 1/3 (S).
Take the JAR SHARDS 2/3 (T).
Examine the vines to trigger a puzzle (U).
Untangle the ropes.
See screenshot for solution (V).
Move the bricks; take the TOKEN (W) and JAR SHARDS 3/3 (X).