Tolfdir the Absent-Minded

Walkthrough
Upon returning from the quest to recover the books from Fellglow Keep ("Hitting the Books"), Tolfdir may ask the Dragonborn to recover his misplaced alembic. The alembic will appear in one of three randomly-selected locations in the Hall of Countenance:
 * On the top floor: in the northern room, atop a barrel to the right of the central table.
 * On the top floor: underneath the left display case in the enchanting room.
 * On the bottom floor: on a crate in the eastern room.

Bugs

 * The quest does not seem to appear on the quest log, nor does it generate a normal quest message upon completion. However, bringing the alembic to Tolfdir will grant you the reward (some gold and a soul gem).
 * After saving the college, Tolfdir may lose his Alembic again.
 * It was reported that even when the quest has been started the Alembic didn't appear anywhere in whole Winterhold college. So far only fix for this bug was adding item by console using marked ID 0026C31.
 * It is also possible that the Alembic stay in your inventory even though you completed the quest and received the reward. It is impossible to remove from your inventory due to the fact that it is a quest item. As a quest item, though, it will not weigh you down.
 * If the Alembic is picked up before asking Tolfdir for the quest, the objective "Find Tolfdir's Alembic" will be stuck in the Misc. Quest menu. To avoid this use the console to drop the Alembic before asking Tolfdir for the quest then pick it up after it appears in your log. This will cause the quest log to update normally.