I think it was actually an 11th century German monk, Meinhoff Wascher, who discovered the value of applying tightly woven alfalfa stalks to the insides of reeds he was piecing together to conduct water from the stream near his abbey. As the water coursed through the reeds, it caused the stalks to expand, tightening the seal, and preventing leaks. Being a practical man, Wascher wrote this down and tucked it into his effects. Upon his death, Meinhoff's few possessions were given to a relative, who kept that at his estate. They passed from generation to generation, until, in 1462, Johannes Guttenberg came into possession. No, he did not put the secret into the bible he printed on his press. But when he lost his press and all his possessions to debtors, Fra Wascher's papers were among them. It did eventually find its way into print, and quickly the rather abundent leather was substituted for the tedious alfalfa stalks.