2d. To carry said mail in a safe and secure manner, free from wet or other injury, in weather-proof bags and vehicles on the land route, and in a separate and convenient apartment on shipboard, to be suitably fitted up under order of the department, at the expense of the contractors, for the assorting and safe-keeping of the mails, and for the sole and exclusive occupation, use, and accommodation of the Post Office Department and its mail-agent, if the Postmaster General shall require it for the use and accommodation of the mail and mail-agent, and such mail-agent is to be conveyed without further charge. In case the contractors fail to furnish such suitable accommodations, the department shall have the right to provide the bags, vehicles, or apartments, or other suitable accommodations, at the expense of the contractors. 3d. To take the mail and every part of it from, and deliver it and every part of it into, the post office at San Francisco, and to and from the mail steamers at Vera Cruz on the New Orleans and Vera Cruz line, and also to deliver and receive the mails at San Diego and Monterey, regularly by each trip going and returning, as is now done by the “Pacific Mail Steamship Company.” They also undertake, covenant, and agree with the United States, and do bind themselves, jointly and severally, as aforesaid, to be answerable for the person to whom the said contractors shall commit the care and transportation of the mail, and accountable to the United States for any damages which may be sustained by the United States through his unfaithfulness or want of care; and that the said contractors will discharge any carrier of said mail whenever required to do so by the Postmaster General; also, that they will not transmit by themselves or their agent, or be concerned in transmitting, commercial intelligence more rapidly than by mail, and they will not carry out of the mail letters or newspapers which should go by post; and that they will not, knowingly, convey any person carrying on the business of transporting letters or other mail matter without the consent of the department; and further, that the said contractors will convey, without additional charge, post-office blanks, mail bags, and the special agents of the department, on the exhibition of their credentials. They further undertake, covenant, and agree with the United States, that the said contractors will collect quarterly, if required by the Postmaster General, of postmasters on said route, the balances due from them to the General Post Office, and faithfully render an account thereof to the Postmaster General in the settlement of quarterly accounts, and will pay over to the General Post Office all balances remaining in their hands.