text:  But in addition to this how much is necessary to make a work which shall really stand the test of time in the delineation of the present countries of the world and the existing state of their inhabitants? How many branches of knowledge are called for how many sources of information required how many enthusiastic pursuits necessary to enable the traveller worthily to discharge his mission? Eyes and no Eyes are nowhere more conspicuous in human affairs; and unhappily eyes are never given but to the mind which has already seen and learned much