“Of the life of Alexander we have five consecutive narratives, besides numerous allusions and fragments scattered up and down various Greek and Latin writers.... Unluckily, among all the five there is not a single contemporary chronicler.... The value of all, it is clear, must depend upon the faithfulness with which they represent the earlier writings which they had before them, and upon the amount of critical power which they may have brought to bear upon their examination. Unluckily again, among all the five, one only has any claim to the name of a critic. Arrian alone seems to have had at once the will and the power to exercise a discreet judgment upon the statements of those who went before him. Diodôros we believe to be perfectly honest, but he is, at the same time, impenetrably stupid. Plutarch, as he himself tells us, does not write history, but lives; his object is rather to gather anecdotes, to point a moral, than to give a formal narrative of political and military events. Justin is a feeble and careless epitomizer. Quintus Curtius is, in our eyes, little better than a romance writer; he is the only one of the five whom we should suspect of any wilful departure from the truth.”—From _Historical Essays_, by Professor Freeman, 2d series, third edition, pp. 183, 184. INTRODUCTION The invasion of India by Alexander the Great, like the first voyage of Columbus to America, was the means of opening up a new world to the knowledge of mankind. Before the great conqueror visited that remote and sequestered country, which was then thought to lie at the utmost ends of the earth, nothing was known regarding it beyond a few vague particulars mentioned by Herodotos, and such grains of truth as could be sifted from the mass of fictions which formed the staple of the treatise on India written by Ktêsias of Knidos. A comparison of this work with the _Indika_ of Megasthenes, which was written after the invasion, will show how entirely all real knowledge of the country was due to that event. It may even, we think, be asserted that had that invasion not taken place, the knowledge of India among the nations of the West would not have advanced much beyond where Ktêsias left it, until the maritime passage to the East by the Cape of Good Hope had been discovered.