Mammoth tusks of ivory occasionally come to this country from Siberia; but as these have been lying exposed for centuries, and probably for many thousands of years, and often buried in ice, the ‘nature’ has gone out of them, and they are not fit for the cutler’s use. The teeth of the walrus and hippopotamus are used in considerable quantity, and being of suitable size, are used whole for making expensive carved handles. Ivory of the best quality comes from the west coast of Africa, under the names of Cameroon, Angola, and Gaboon ivory. This is brought down from the interior, and retains a larger proportion of the ‘fat’ or gelatine, from the fact, probably, that it is more recently from the animal. In this state it is called ‘green’ ivory. It is more translucent, and not so white as the Egyptian and other kinds, called ‘white’ ivory, that have been lying a longer time and in a more sandy region, and exposed to the heat of the sun until the animal matter has disappeared. The excellence of the ‘green’ ivory consists in its greater toughness and in its growing whiter by age, instead of yellow, as is the case with the whiter varieties. Yet buyers of cutlery, through ignorance of these qualities, usually prefer the whiter kinds, which on that account are more in demand for the Sheffield trade, and have more than doubled in price since 1879. The sales of ivory occur every three months at London and Liverpool, and sales are also held to a limited extent and at irregular intervals at Rotterdam. At Liverpool, only ivory of the best quality, and from the west coast of Africa, is offered. Buyers from Germany and France and agents of American consumers attend these sales; and it is estimated that about one quarter of the whole amount goes to Sheffield, another quarter to London, and the other half to Germany, France, and the United States.