The natives effusively thanked them after welcome rain, and looked askance at them, scowling, after long dry spells.

It was for this, no doubt, that they took such pains to provide them with attentive Shadows, and to gird round their movements with taboos of excessive stringency.

Nothing that the new-comers said or did was indifferent, it seemed, to the welfare of the community; plenty and prosperity depended upon the passing state of Muriel's health, and famine or drought might be brought about at any moment by the slightest imprudence in Felix's diet.
How stringent these taboos really were Felix learned by slow degrees alone to realize.

From the very beginning he had observed, to be sure, that they might only eat and drink the food provided for them; that they were supplied with a clean and fresh-built hut, as well as with brand-new cocoanut cups, spoons, and platters; that no litter of any sort was allowed to accumulate near their enclosure; and that their Shadows never left them, or went out of their sight, by day or by night, for a single moment.

Now, however, he began to perceive also that the Shadows were there for that very purpose, to watch over them, as it were, like guards, on behalf of the community; to see that they ate or drank no tabooed object; to keep them from heedlessly transgressing any unwritten law of the creed of Boupari; and to be answerable for their good behavior generally.