This utterly and charmingly bonkers song about Microbes came from a book of Victorian music called Nine Medical Songs by Blumfeld, Ransome, Chadborn, published in 1895.
The words for our extract are:
Bacillus Prodigiosus
loved a Micrococcus wee,
He fairest and most faintly stained,
of all her colony:
He felt the spasm of protoplasm,
by Love's sweet bitters bitten:
With anguish racked, he was in fact
Prodigiousely smitten:
With anguish racked, he was in fact
Prodigiousely smitten.
Around him many a rod-shap'd dame,
in vain her arts would ply,
They could not even stir in him a bacilliary sigh
[...]
No longer growing on bread-paste and bouillon
He soought all ways to mock us,
Just beause his sweetheart was
A plumpish micrococcus.