Romantic love—commonly considered immutable—not only displays countless
individual variations in regard to duration and degrees of intensity,
but has a sort of “local colour” in each country; or, to keep up our old
metaphor, a varying clangtint, depending on the greater or less
prominence of certain “overtones.”
To describe all these varieties of Love would require a separate volume.
And since all the most interesting forms of the romantic passion are to
be met with in France, Italy, Spain, Germany, England, and America, it
will suffice to briefly characterise Love in those countries.