The advent of the Jesuits to western Mexico in 1642, developed amicable relations with the Indians; and although the missionaries were agriculturists rather than fishermen, the restoration of harmony resulted in a more favorable prosecution of the fisheries. The colonists of Sinaloa and Nueva Galicia, who had formerly, in small vessels and with great danger, made occasional visits to the pearl beds, built larger vessels and made more frequent visits without apprehension. The skilful Yaqui and Mayo Indians were employed or impressed as divers, just as natives of the Bahamas had served in the fisheries of Venezuela. Great profits resulted from the operations. Venegas wrote that “it was certain that the fifth of every vessel was yearly farmed for 12,000 dollars.”[288] So profitable was the fishery that the Spanish soldiers and sailors stationed in the Gulf of Cortes—as the Gulf of California was then called—were frequently charged with devoting more attention to pearling than to their official duties. In order to put a stop to this evil, in 1704, Father Silva-Tierra, who was in authority in that part of the country, ordered that no soldier or sailor should engage in the fishery. With a view to removing the demoralizing influences of promiscuous adventurers among the Indians, the industry was later restricted to persons specially authorized. Probably the most successful of the early pearlers was Manuel Osio, who is credited with having marketed “127 pounds’ weight of pearls in 1743,” and “275 pounds’ weight” in 1744.[289] He operated in the vicinity of Mulege and northward, employing the Yaqui Indians; and through his pearling interests is said to have become the richest man in Lower California. [Illustration: Gulf of California and the pearling territory of western Mexico ]