Read it through once

3. “The Poor Man's Friend.” You will next worship this god. He is at the bottom of a stone cistern in the temple of Dalbhyeswar, under the shade of a noble peepul tree on the bluff overlooking the Ganges, so you must go back to the river. The Poor Man's Friend is the god of material prosperity in general, and the god of the rain in particular. You will secure material prosperity, or both, by worshiping him. He is Shiva, under a new alias, and he abides in the bottom of that cistern, in the form of a stone lingam. You pour Ganges water over him, and in return for this homage you get the promised benefits. If there is any delay about the rain, you must pour water in until the cistern is full; the rain will then be sure to come.