prevent the grass seed from sprouting properly.[374] In some of the Melanesian islands, when the yam vines are being trained, the men sleep near the gardens and never approach their wives; should they enter the garden after breaking this rule of continence the fruits of the garden would be spoilt.[375] In the Motu tribe of New Guinea, when rain has fallen plentifully and there is promise of a good crop of bananas, one of the chief men becomes holy or taboo, and must live apart from his wife and eat only certain kinds of food. He bids the young men beat the drum and dance, “in order that by so doing there may be a large harvest. If the dancing is not given, there will be an end to the good growth; but if it is continued, all will go well. People come in from other villages to assist, and will dance all night.”[376] In the Mekeo district of British New Guinea, when a taboo has been put on the coco-nuts and areca-nuts to promote their growth, some fourteen or fifteen men act as watchmen to enforce the taboo. Every evening they go round the village armed with clubs and wearing masks or so covered with leaves that nobody would know them. All the time they are in office they may not chew betel nor drink coco-nut water, lest the areca-nuts (which are eaten with betel) and the coco-nuts should fail. Moreover, they may not live with their wives; indeed, they may not even look at a woman, and if they pass one they must keep their eyes on the ground.[377] Among the Kabuis of Manipur, before the rice is sown and when it is reaped, the strictest chastity has to be observed, especially by the religious head of the village, who, besides always taking the omens on behalf of the villagers, is the first to sow and the first to reap.[378] Some of the tribes of Assam believe that so long as the crops remain ungarnered, the slightest incontinence might ruin all.[379] In the incense-growing region of Arabia in antiquity there were three families charged with the special care of the incense-trees. They were called sacred, and at the time when they cut the trees or gathered the incense they were forbidden to pollute themselves with women or with the contact of the dead; the observance of these rules of ceremonial purity was believed to increase the supply of incense.[380] Apparently the incense itself was deemed holy, for on being gathered it was deposited in the sanctuary of the Sun, where the merchants inspected and purchased it.[381] With ancient Greek husbandmen it was a maxim that olives should always be planted and gathered by pure boys and virgins; the uncommon fruitfulness of the olive-trees at Anazarbus in Cilicia was attributed to their being tended by young and innocent children. In default of such workers, the olive-gatherer had to swear that he had been faithful to his own wife; for his fidelity was believed to ensure an abundant crop of fruit the following year.[382]