As the author was commissioned, not merely as a discoverer, but a diplomatist, it is to be presumed that on many interesting points he writes under the restraints of diplomatic reserve. But he has told us enough to excite our strong interest in the beauty, the fertility, and the capabilities of the country which he describes; and more than enough to show, that it is almost a British duty to give the aid of our science, our inventions, and our principles, to a monarch and a people evidently prepared for rising in the scale of nations.

We have a kind of impression, that some general improvement is about to take place in the more neglected portions of the world, and that England is honoured to be the chief agent in the great work. Africa, which has been under a ban for so many thousand years, may be on the eve of relief from the misery, lawlessness, and impurity of barbarism; and we are strongly inclined to look upon this establishment of British feeling, and intercourse in Abyssinia, as the commencement of that proud and fortunate change. All attempts to enter Africa by the western coast have failed. The heat, the swamps, the rank vegetation, and the unhealthy atmosphere, have proved insurmountable barriers. The north is fenced by a line of burning wilderness. But the east is open, free, fertile, and beautiful. A British factory in Abyssinia would be not merely a source of infinite comfort to the people, by the communication of European conveniences and manufactures, but a source of light. British example would teach obedience and loyalty to the laws, subordination on the part of the people, and mercy on that of the sovereign.

But we have also another object, sufficiently important to determine our Government in looking to the increase of our connexion with Eastern Africa. It is certainly a minor one, but one which no rational Government can undervalue. The policy of the present French King is directed eminently to the extension of commercial influence in all countries. To this policy, none can make objection. It is the duty of a monarch to develop all the resources of his country; and while France exerts herself only in the rivalry of peace, her advance is an advance of all nations. But her extreme attention, of late years, to Africa, ought to open our eyes to the necessity of exertion in that boundless quarter. On the western coast, she had long fixed a lazy grasp; but that grasp is now becoming vigorous, and extending hour by hour. Her flag flies at Golam, 250 miles up the Senegal. She has a settlement at Gori; she has lately established a settlement at the mouth of the Assinee, another at the mouth of the Gaboon, and is on the point of establishing another in the Bight of Benin; when she will command all Western Africa.

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.

On the whole, it is highly gratifying to our respect for British soldiership; to see works of this rank proceeding from our military men. They have great opportunities, and may thus render national services in peace, not less important than their enterprise in war. The East India Company offers inducements of the most important order, to the accomplishment and scientific activity of its officers; and Major Harris must feel the distinction of having been selected for a mission of such interest, as well as the high gratification of having conducted it to so benevolent, solid, and satisfactory a close.