Very commonly, indeed, we have observed that these faithful pictures have conveyed to ourselves more copious and correct ideas of detail than the inspection of the subjects themselves had supplied; for there appears to be a greater aptitude in the mind for careful and minute study from paper, and at intervals of leisure, than when the mind is occupied with the general impressions suggested by the view of the objects themselves, accompanied, as inspections usually are, by some degree of unsettlement, or of excitement, if the object be of great or unwonted interest.