This illustration depicts the protagonist, having been newly transformed into a water baby, learning from a salmon and his wife of the existence of other water babies.
Madness string 4256
The paper mentions that 'Introducing N-oxides onto the tetrazole ring may ... push the limits of well-explored tetrazole chemistry into a new, unexplored, dimension', but (of more immediate importance) it may also push pieces of your lab equipment into unexplored parts of the far wall.