She is not less active on the eastern shore. At Massawah, on the coast of Abyssinia, she is fast monopolizing the trade in gold and spices. She has purchased Edh, and is endeavouring to purchase Brava. Her attention to _Northern_ Abyssinia is matter of notoriety, and we must regard this system, not so much with regard to advantages which such possessions might give to ourselves, as to their prejudice to us in falling into rival hands. The possession of Algeria should direct the eye of Europe to the ulterior objects of France; the first change of masters in Egypt, must be looked to with national anxiety; and the transmission of the great routes of Africa into her hands, must be guarded against with a vigilance worthy of the interests of England and Europe. If the river shall be found navigable to any extent, what an opening is thus presented to both the Merchant and the philanthropist; a soil surpassed by none in the world, a climate varying only 1º in the mean temperature of summer and winter, and presenting an average of 55-1/2º, and a population who could hardly fail to feel the advantages of commerce and civilization. From such a point as Aden offers, access is promised to the very heart of Africa, and thence to the sources of the mighty rivers which find an outlet on the western side of the continent; thus not merely benefiting the British merchant in a remarkable degree, but rapidly abolishing the slave trade, by giving employment to the people, wealth to the native trader, and a new direction to the powers of the country and the mind of its unhappy population. On the whole consideration of the subject, we feel convinced, that Eastern Africa is the safe and the natural point for British enterprise; that it is the most direct and effective point for the extinction of the cruel traffic in human flesh; and that it is the most promising and productive point for the establishment of that substantial connexion with the governments of the interior, which alone can be regarded as worth the attention of the statesman. Insignificant stations on the coast, to carry on a peddling traffic, are beneath a manly and comprehensive policy. We must penetrate the mountains, ascend the rivers, and reach the seats of sovereignty. We must, by a large and generous self-interest, combine the good, the knowledge, and the virtue of the population with our own; and we must lay the foundation of our permanent influence over this fourth of the globe, by showing that we are the fittest to communicate the benefits, and establish the example of civilized society. To those who desire to go into more minute details, we recommend an accompanying volume by the missionaries Isenberg and Krapf--the latter of whom acted as interpreter to the embassy. A capital geographical memoir is also given by Mr M'Queen, the well-known African geographer.