In Dr. Pennell's book, the title of which stands at the head of this article, we have a vivid description, drawn from life, of the names, habits, and peculiarities of these primitive communities, with many incidental examples of the relations existing between them and the British officers who are in touch with them on the frontier. Lord Roberts, in a short introduction that may be taken as a guarantee of the accuracy and authenticity of the volume's contents, tells us that it is a valuable record of sixteen years' good work by a medical missionary in charge of a mission station at Bannu, on the north-western frontier of India. And Dr. Pennell's experience, acquired in the prodigious enterprise of taming and converting to Christianity some of the most murderous ruffians and inveterate robbers in Asia, has provided him with a rare insight into their character, and furnished him with numerous anecdotes of their strange inconsistencies and wayward, impulsive nature. On the Afghan frontier, indeed, we may survey a situation that has frequently recurred in the history of organised governments, whenever they have found themselves in contact, and therefore in collision, with intractable barbarism. Immediately across the border line may be seen in the Afridi tribes a complete and living picture of man in his aboriginal condition of perpetual war, under no government at all, in daily peril of ending by a violent death a life that in the pithy words of Hobbes is 'poor, nasty, brutish, and short.' A few steps back into the British district brings us among men, often of the same breed and tribe, dwelling without arms in peace and security, pleading before regular law courts, learning in English schools, occupied in commerce and industry under the protection of magistrates and police. The contrast in morals and manners is as abrupt as the transition from the Afghan hills to the Indian plains. Such is the frontier along which British officers are charged with duties of watch and ward. Their business is to guard the Indian districts that march with the wild borderland, to prevent or punish incursions by the marauding tribes who have continued from time immemorial to live in practical anarchy. They obey no laws and acknowledge no ruler, though in emergencies they appeal alternately to the Afghan Amir for assistance against the British and to the British Government against any encroachments by the Amir.