I can't help suspecting, that there is, or may be some regurgitation from the bath into the cistern of the pump. In that case, what a felicate beveridge is quaffed by the drinkers; medicated with the sweat and the dirt, and dandriff; and the abominable of various kinds, from twenty different diseased bodies, parboiling in the kettle below.
In order to witness clearly the march of humanity from its inception to the present moment, an understanding of how humankind has held encounter with the divine as central is crucial. Ancient humanity provides us with an excellent laboratory for gaining such an understanding.