Besides their clear description of military manoeuvres, of engineering, bridge-making, and all kinds of operations, in which they may be compared with the despatches of the great generals of modern times, Caesar's _Commentaries_ contain much useful information regarding the countries he visited. There is a wonderful freshness and versatility about his mind. While primarily considering a country, as he was forced to do, from its strategical features, or its capacity for furnishing contingents or tribute, he was nevertheless keenly alive to all objects of interest, whether in nature or in human customs. The inquiring curiosity with which Lucan upbraids him during his visit to Egypt, if it were not on that occasion assumed, as some think, to hide his real projects, was one of the chief characteristics of his mind. As soon as he thought Gaul was quiet he hurried to Illyria, [14] animated by the desire to see those nations, and to observe their customs for himself. His journey into Britain, though by Suetonius attributed to avarice, which had been kindled by the report of enormous pearls of fine quality to be found on our coasts, is by himself attributed to his desire to see so strange a country, and to be the first to conquer it. [15] His account of our island, though imperfect, is extremely interesting. He mentions many of our products. The existence of lead and iron ore was known to him; he does not allude to tin, but its occurrence can hardly have been unknown to him. He remarks that the beech and pine do not grow in the south of England, which is probably an inaccuracy; [16] and he falls into the mistake of supposing that the north of Scotland enjoys in winter a period of thirty days total darkness. His account of Gaul, and, to a certain extent, of Germany, is more explicit. He gives a fine description of the Druids and their mysterious religion, noticing in particular the firm belief in the immortality of the soul, which begot indifference to death, and was a great incentive to bravery. [17] The effects of this belief are dwelt on by Lucan in one of his most effective passages, [18] which is greatly borrowed from Caesar. Their knowledge of letters, and their jealous restriction of it to themselves and express prohibition of any written literature, he attributes partly to their desire to keep the people ignorant, the common feeling of a powerful priesthood, and partly to a conviction that writing injures the memory, which among men of action should be kept in constant exercise. His acquaintance with German civilization is more superficial, and shows that incapacity for scientific criticism which was common to all antiquity. [19] His testimony to the chastity of the German race, confirmed afterwards by Tacitus, is interesting as showing one of the causes which have contributed to its greatness. He relates, with apparent belief, the existence of several extraordinary quadrupeds in the vast Hercynian