73

«The food and clothing consumed by the labourer, the buildings in which he works, the implements with which his labour is assisted, are all of a perishable nature. There is however a vast difference in the time for which these different capitals will endure: a steam-engine will last longer than ship, a ship tham the clothing of the labourer, and the clothing of the labourer longer than the food which he consumes». Ricardo, etc., p. 26.