Little Johnnie was a chemist
Little Johnnie is no more
What Johnnie thought was H2O
Was H2SO4.
Auntie Jane gave Baby Nell
What she thought was calomel
But alas what baby ate
Was corrosive sublimate
A dreadful error I confess
One atom and one baby less
I remember that, and this one, posted on the science bulletin board in HIGH SCHOOL (70’s). I can’t believe that brain cell’s still alive! I did have to look up the chemicals (Corrosive sublimate - HgCl2; Calomel - Hg2Cl2) though I remember them being shown as footnotes. There was one more poem on the sheet, which I’ll probably wake up at 2 am remembering.