More colonists arrived in parties great and small; and by the spring of 1848 approximately seventeen hundred souls were encamped in the valley, more than four hundred dwellings had been erected within the confines of the old fort, and about five thousand acres of land had been brought under cultivation. In May and June, the settlers were arrayed in battle order, not against human foes but to fight the dreaded insect scourge, the Rocky Mountain crickets, which in countless hordes descended from the mountains and invaded the fields and gardens. Every member of the little community, man, woman, or child, was called into action but to little purpose. When the people had been reduced to despair they were saved by what they devoutly believed to be a special and miraculous interposition of Providence. There suddenly appeared on the western horizon a tremulous cloud which grew in magnitude as it rapidly approached, until at last it was seen to be the vanguard of an advancing army of gulls. Down swooped the white-winged deliverers, devouring the crickets with incredible voracity until but few were left alive. Since that day the gulls have been sacred in Utah. Every spring they come to follow the plough as it turns the soil for the season's seed, and so confident are they of their safety that they may be approached almost within arm's length. Added to the ruin wrought by the crickets was a further deprivation, due to drought and frosts. The harvest of 1848 was little better than a failure, and the succeeding winter and spring were seasons of extreme destitution. The people were brought to the dire necessity of gathering the wild weeds of the desert and even of boiling the raw hides in their camps for sustenance. The bulbous roots of the sego lily--now the banner-flower of the State--were dug for food; but the pangs of hunger were an experience from which none escaped. However, the following season brought a more abundant return from the soil and the prospects of the colony brightened. In February, 1848, the treaty of Guadaloupe Hidalgo secured by cession from Mexico to the United States the region now embraced by Arizona, New Mexico, Utah, Nevada, and California. The great republic reached the Pacific, and Salt Lake City became an integral part of the United States. Up to this time, and, indeed, for a year thereafter, the governmental affairs of the new community were administered almost wholly by the Church authorities. In February, 1849, the city was divided into nineteen ecclesiastical wards, over each of which a "bishopric" presided, consisting of a bishop and his two counsellors, who combined with their purely churchly function the duties of magistrates and civil officers. They regulated the levying and disbursing of taxes, the construction of roads and bridges, and the like.[16] [Illustration JEDEDIAH M. GRANT, FIRST MAYOR OF SALT LAKE CITY.]