"After which, you are to proceed to the entrance of the River Plata, to ascertain the longitudes of the Cape Santa Maria, and Monte Video: you are then to proceed to survey the Coasts, Islands, and Straits; from Cape St. Antonio, at the south side {xvii} of the River Plata, to Chilóe; on the west coast of America; in such manner and order, as the state of the season, the information you may have received, or other circumstances, may induce you to adopt. "You are to continue on this service until it shall be completed; taking every opportunity to communicate to our Secretary, and the Commander-in-Chief, your proceedings: and also, whenever you may be able to form any judgment of it, where the Commander-in-Chief, or our Secretary, may be able to communicate with you. "In addition to any arrangements made with the Admiral, for recruiting your stores, and provisions; you are, of course, at liberty to take all other means, which may be within your reach, for that essential purpose. "You are to avail yourself of every opportunity of collecting and preserving Specimens of such objects of Natural History as may be new, rare, or interesting; and you are to instruct Captain Stokes, and all the other Officers, to use their best diligence in increasing the Collections in each ship: the whole of which must be understood to belong to the Public. "In the event of any irreparable accident happening to either of the two vessels, you are to cause the officers and crew of the disabled vessel to be {xviii} removed into the other, and with her, singly, to proceed in prosecution of the service, or return to England, according as circumstances shall appear to require; understanding that the officers and crews of both vessels are hereby authorized, and required, to continue to perform their duties, according to their respective ranks and stations, on board either vessel to which they may be so removed. Should, unfortunately, your own vessel be the one disabled, you are in that case to take the command of the Beagle: and, in the event of any fatal accident happening to yourself; Captain Stokes is hereby authorized to take the command of the Expedition; either on board the Adventure, or Beagle, as he may prefer; placing the officer of the Expedition who may then be next in seniority to him, in command of the second vessel: also, in the event of your inability, by sickness or otherwise, at any period of this service, to continue to carry the Instructions into execution, you are to transfer them to Captain Stokes, or to the surviving officer then next in command to you, who is hereby required to execute them, in the best manner he can, for the attainment of the object in view. "When you shall have completed the service, or shall, from any cause, be induced to give it up; you will return to Spithead with all convenient expedition; and report your arrival, and proceedings, to our Secretary, for our information. {xix}