Hence the lower surface generally affords to entomologists the more useful character for detecting the affinities of the various species.
At first it establishes affections between beings naturally conjoined in the world; later it grows sensitive to free and spiritual affinities, to oneness of mind and sympathetic purposes.
These ideal affinities, although grounded like the others on material relations (for sympathy presupposes communication), do not have those relations for their theme but rest on them merely as on a pedestal from which they look away to their own realm, as music, while sustained by vibrating instruments, looks away from them to its own universe of sound.