To-day in our midst there are no such story-tellers, no such Bhuvas and medicine-men, or, if there are any, they are seldom given a chance. We rather like to listen to the stories of the microscope and pin our faith to the doctor and the scientist. These men of science scent _Ekānterio_ in every anopheles mosquito and tell us that malarial fever is conveyed from one human being to another by the bite of this ubiquitous insect. Therefore, if we wish to stamp out malaria, we must wage a crusade against this vast army of _Ekānterio_. It is well known that these mosquitoes breed in water and that they are particularly fond of well water. One of the measures that the Bombay Municipality has therefore to enforce in connection with its campaign against malaria is the closing of wells containing the larvæ of these mosquitoes. In the early stages of the campaign, however, it gave rise to vehement protests. These were prompted not merely by utilitarian motives, but also by religious sentiments and supernatural beliefs. The aggrieved parties gave chapter and verse to show that their scriptures enjoined the use of well water, and well water only, in connection with divers ceremonies, and they further relied on several popular beliefs investing the water of wells with supernatural efficacy. We shall record a few typical examples of such beliefs and convictions and a few traditions concerning several wells of Bombay, culled from the official correspondence on the subject and other sources, and we shall see in the course of our survey that these merely present, with a little local colouring, the particular primitive phase of nature-worship under which all nations inhabiting the globe have held in the past, and do hold to a certain extent even now, springs and wells in religious reverence and awe, regarding the water thereof as a living organism or as a dwelling-place of spirits. When the owner of an objectionable well is asked by the Municipality either to fill up the well or to cover it, he invariably prefers the second alternative, provided he is allowed to cover the well with wire gauze or at least to provide a wire gauze trap-door for drawing water. The reason given in most of the cases is that according to tenets and established customs the water required for religious ceremonies must be exposed directly to the rays of the sun and that water not so exposed is rendered unfit for the purpose. The Parsis cite their scriptures and the Hindus theirs in support of this contention. It is unnecessary for our present purpose to quote the injunctions of the scriptures, but it is interesting to note how they are construed and understood.