Chemistry Apparatus Cartoon: The Boiling Tube

I realise that my series of Chemistry Apparatus Cartoons has a large number of tubes in it.  But, to be fair, chemistry is full of tubes.  This is the last one in my series - I have two more non-tubes to follow.  After the measuring cylinder, I thought it was time to go back to the tubes:  here he is - the boiling tube.

Next time?  I only have two more in the series (unless inspiration hits me again), but we're not scraping the bottom of the barrel yet!