text:  He has so many topics of which he is master himself that he forgets with how few comparatively his readers are familiar; he sees so many objects of enquiry--physical moral and political--in the countries which he visits that he becomes insensible to the fact that though each probably possesses a certain degree of interest to each reader yet it is scarcely possible to find one to whom as to himself they are _all alike_ the object of eager solicitude and anxious investigation