Very seldom a few vessels sail to Manila from Sian and Camboja. They carry some benzoin, pepper, ivory, and cotton cloth; rubies and sapphires, badly cut and set; a few slaves; rhinoceros horns, and the hides, hoofs, and teeth of this animal; and other goods. In return they take the wares found in Manila. Their coming and return is between the brisas and the vendavals, during the months of April, May, and June. In these classes of merchandise, and in the products of the islands--namely, gold, cotton cloth, mendrinaque, and cakes of white and yellow wax--do the Spaniards effect their purchases, investments, and exports for Nueva Espana. They make these as is most suitable for each person, and lade them on the vessels that are to make the voyage. They value and register these goods, for they pay into the royal treasury of Manila, before the voyage, the two per cent royal duties on exports, besides the freight charges of the vessel, which amount to forty Castilian ducados [241] per tonelada. This latter is paid at the port of Acapulco in Nueva Espana, into the royal treasury of the said port, in addition to the ten per cent duties for entrance and first sale in Nueva Espana. [242] Inasmuch as the ships which are despatched with the said merchandise are at his Majesty's account, and other ships cannot be sent, there is generally too small a place in the cargo for all the purchases. For that reason the governor divides the cargo-room among all the shippers, according to their wealth and merits, after they have been examined by intelligent men, appointed for that purpose. Consequently every man knows from his share how much he can export, and only that amount is received in the vessel; and careful and exact account is taken of it. Trustworthy persons are appointed who are present at the lading; and space is left for the provisions and passengers that are to go in the vessels. When the ships are laden and ready to sail, they are delivered to the general and the officials who have them in charge. Then they start on their voyage at the end of the month of June, with the first vendavals.