What is the origin of this song? Where did the Watersons get it from? Is it from the oral tradition? Do any variants exist? Is it just a Victorian re-creation?

I Learned:

Since man was first crearted His works have been debated And now are celebrated The comming of the horn!

as the first verse from Barry Warmsley, singer, fiddler player and biology teacher, of Birkenhead and other places. Where did this come from? Does anyone else know it?