Duplicates, say four or five specimens, from each volcano, should be taken on board the _Novara_ in boxes of about 3 feet long. It would be too disheartening to have any misgivings of the success of this glorious scheme for getting together a Museum of Volcanic Rocks in Vienna, of all the regions of the globe, arranged upon a regular geographical system, each labelled with its own name, so as to promote a general acquaintance with these branches of knowledge: 1. Europe. 2. Atlantic Islands. 3. Continent of Asia, South Coast of Arabia (Aden), Kamtschatka. 4. Islands of Eastern Asia and India. 5. The Indian Ocean. 6. The Pacific. 7. Continent of South America: Chili, Peru, Bolivia, Quitó and New Grenada. 8. Central America. 9. Mexico, south of the river Gila. 10. North-Western America, north of the river Gila. 11. West Indies. Much of this work might be done on board the _Novara_. As to Nos. 3 and 4, Kamtschatka, the Kurile and Aleutian Islands, the Red Sea, and the West Indies, it will not be difficult to procure specimens at some future period. Our piping times of peace are favourable to the execution of this project, which should be zealously kept in view throughout the Expedition. Travelling as I was, during the great wars, I did not dare shrink from the difficulty of having to carry along with me 44 large boxes, as I did on the road through Mexico from Acapulco to Vera Cruz, whence they were sent to Cuba, Philadelphia, and so to Bordeaux. The mechanical labour of having the collections carefully packed, keeping duplicates distinct, and sending away geological, botanical, zoological and ethnographical collections, is itself quite as important as the purely scientific work.